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Source: (consider it) Thread: Inquire Within: general questions
daisydaisy
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# 12167

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Maybe Buffy as well - but I've never seen that. Maybe it was a TV ad ?
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Scots lass
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The Buffy theme was by a band called Nerf Herder - the opening bit has similarities but they're not the same. I have no idea where it does come from though! My geekery stops at Buffy...
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mertide
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IMDB shows it as used in an episode of Buffy, a documentary called My Sister Maria and a movie from 1996 Breaking the Waves.
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daisydaisy
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Thank you - I've not seen any of those so maybe it was background music in a local shop.
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Huia
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# 3473

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Mathmatical question, which sounds like a school exercise. I want to buy a big pot (3 litres or more). The place where I went looking had pots labelled 20 cm - but they were different depths, with no indication of the volume of liquid they might contain.

If I take a tape measure so I can measure the depth, diameter and circumference, what is the magic formula that will give me the volume?

I think I must have missed the maths that covered volume as I once ordered 9 big truckloads of shingle for a strip down my driveway - fortunately my brother pointed out I'd put the decimal point in the wrong place so I was able to ammend the order before delivery [Hot and Hormonal]

Thanks in advance.

Huia

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Charity gives food from the table, Justice gives a place at the table.

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Carex
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If the diameter is 20cm then the radius is 10cm.

The area of the bottom of the pot is pi (3.14) times the square of the radius, or about 300 square cm. Multiply that by the depth (in cm) to get the volume.

Since 1 litre is 1000 cubic cm, the pot will hold about 1 l for every 3.3cm of depth, and a 3 litre pot will be 10cm deep.

[too many words]

[ 12. September 2014, 22:58: Message edited by: Carex ]

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Palimpsest
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That's the volume if the pot is a cylinder.
If it's a truncated cone the formula is

V = π × h × (R²+r²+R×r) ⁄ 3

where r and R are the radius of the top and bottom of the pot and h is the height (depth). Measure from the inside.

this may help:
calculate the volume of a truncated cone

And for pot bellied pots, you're on your own.

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Lamb Chopped
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The laziest way of doing it is to find a neighbor with the right size pot (or an online picture of one with some visual in the pic for comparison) so you can eyeball it.

Failing that, get a big waterproof container of any sort, the closer to the shape and diameter of the pot you want to buy. Then measure out 3 L of water into it, and either eyeball it or mark the depth of the water on a chopstick. Take the chopstick with you when you go shopping.

Math does my head in.

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Er, this is what I've been up to (book).
Oh, that you would rend the heavens and come down!

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itsarumdo
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quote:
Originally posted by Palimpsest:
That's the volume if the pot is a cylinder.
If it's a truncated cone the formula is

V = π × h × (R²+r²+R×r) ⁄ 3

where r and R are the radius of the top and bottom of the pot and h is the height (depth). Measure from the inside.

this may help:
calculate the volume of a truncated cone

And for pot bellied pots, you're on your own.

if you assume that pi is approx 3, then pi/3 is about 1

and the equation simplifies to

V = h.(R^3 - r^3)/(R-r)

Since most vessels are not particularly conical and have almost straight sides, it's easiest to just guess what the average radius is and say V = 3.h.r² approx. Same goes for a pot bellied pot - if you guess the equivalent average depth, you can still calc it as a simple cylinder. I find this works pretty well.

[ 13. September 2014, 10:18: Message edited by: itsarumdo ]

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"Iti sapis potanda tinone" Lycophron

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Chocoholic
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If it is a cylinder and you google "volume of a cylinder" a little box at the top before the web addresses has a place you can enter the height and radius to give the answer. It doesn't have dimensions though so just be careful of your units. If you put them in in cm you will get an answer in cubic cm, or ml. So divide by 1000 to get no of litres.
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Brenda Clough
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The other simple way is to go shop on line. Find a similar pot on a kitchen supply web site, or on Amazon or something. The description should tell you things like the volume the pot holds. I assume you do not need this accurate to the ounce? So a good-enough approximation should be sufficient.

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Science fiction and fantasy writer with a Patreon page

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Autenrieth Road

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Does anyone know why, when graphing functions, we put the independent variable on the horizontal axis?

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Truth

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Jengie jon

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Well technically it can be either, and some specialist charts do not. However here are two possible. Firstly the dependent variable is normally the variable of interest. Putting it on the vertical axis makes it easy to say whether it is going "up" or "down" because they map literally onto the terms. Secondly we read from left to right so horizontal is the way we make "naturally"* comparisons. Independent variables (explanatory** variables) are normally used for interpretation by comparing different values of them. Therefore, it seems sensible to have them going across.

Jengie

*"naturally" because if you really pushed me I would say "due to the wider culture" rather than completely natural. However, in everyday events that is how we think.

**"Explanatory", the term I prefer; if you really push me "Explanatory Factors" but I tend not to feel the need to flag up that theoretically these have no random component as much as I do not want to assume these are "Independent***". It refers to the fact that the theory sees this variable as indicative of something that allows explanation of the other dependent variable. Note "explanation" not causation.


***"Independent" means uncorrelated but independent variables can be correlated!

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"To violate a persons ability to distinguish fact from fantasy is the epistemological equivalent of rape." Noretta Koertge

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Sipech
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quote:
Originally posted by Autenrieth Road:
Does anyone know why, when graphing functions, we put the independent variable on the horizontal axis?

*dons the mathematician's hat*

Convention. There's nothing that compels us to order things this way round. It can be argued that it is a form of traditionalism, whereby any original reason for doing something is lost and now we end up doing it "because that's the way we've always done it".

It can be helpful, as well as refreshing, to look at things from another perspective every now and then.

*takes off the mathematician's hat*

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I try to be self-deprecating; I'm just not very good at it.
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Adam.

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It is just convention, but the interesting question is why the convention settled that way. I would link it the way we write left to right (rather than top to bottom, etc). If I measure the temperature of my bubbling chemical each minute for five minutes, say, I could record what I saw as:

70, 72, 75, 90, 88.

It might be helpful to replace those numbers with bars of that height. It's a short line from there to plotting a curve.

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Ave Crux, Spes Unica!
Preaching blog

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Lamb Chopped
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I think you're right, it was the direction of reading that settled the matter. If graphing had first become a Thing™ in (say) Chinese, we might have had the axes reversed.

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Er, this is what I've been up to (book).
Oh, that you would rend the heavens and come down!

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Autenrieth Road

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Thanks for the replies.

I want to probe deeper than "it's just convention." If there is no specific reason that can be found, I'd like to at least get to the point of "as far back as we can find people making graphs [reference sources back to the year dot], we find people making their graphs this way."

What Lamb Chopped and Hart say about it being about the direction we write sounds plausible to me. The indepedendent variable might typically come in increments (if only ordinal increments of "this is the first value I recorded, this is the second value, this is the third value, etc.") which one might write horizontally as usual. Tabular ways of recording the data, as an ordered vertical list of x,y values, one pair per row, might have led to the independent variable on the x-axis, but those methods of organization might have come later.

Just hypothesizing here. I'd love to find some historical math sources that talk about graphing.

[ 16. September 2014, 14:13: Message edited by: Autenrieth Road ]

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Truth

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itsarumdo
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# 18174

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I don't know if there are cultural differences (like Chinese) but mostr people represent past to their left and future to their right - so e.g. if you remember, you tend to look to the left and if you think about possibilitiues you would tend to look to the right. So this may be a basis for axes directions, and it is afaik something to do with representation of time/space in the brain and sensory system, so it is to a large degree hardwired.

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"Iti sapis potanda tinone" Lycophron

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Adam.

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I don't know about that. In Hebrew, the word for "East" also means "past / ancient," and maps were drawn with East at the top.

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Ave Crux, Spes Unica!
Preaching blog

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Ariel
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# 58

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Can anyone recommend a good (=readable) book about the Cathars?
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itsarumdo
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quote:
Crap spouted by Hart:
* don't know about that. In Hebrew, the word for "East" also means "past / ancient," and maps were drawn with East at the top.

So culturally, Hebrew looks to the past, not only as a direction of reference, but at the dawn of each day? That's curious.

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"Iti sapis potanda tinone" Lycophron

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Jengie jon

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The answer maybe because that is the way William Playfair did it.

Jεngiε

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"To violate a persons ability to distinguish fact from fantasy is the epistemological equivalent of rape." Noretta Koertge

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Lamb Chopped
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quote:
Crap spouted by itsarumdo:
quote:
Crap spouted by Hart:
* don't know about that. In Hebrew, the word for "East" also means "past / ancient," and maps were drawn with East at the top.

So culturally, Hebrew looks to the past, not only as a direction of reference, but at the dawn of each day? That's curious.
Considering that dawn is mid-24hour day in their system of time keeping (which starts with sundown), maybe not.

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Er, this is what I've been up to (book).
Oh, that you would rend the heavens and come down!

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itsarumdo
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quote:
Originally posted by Lamb Chopped:
quote:
Crap spouted by itsarumdo:
quote:
Crap spouted by Hart:
* don't know about that. In Hebrew, the word for "East" also means "past / ancient," and maps were drawn with East at the top.

So culturally, Hebrew looks to the past, not only as a direction of reference, but at the dawn of each day? That's curious.
Considering that dawn is mid-24hour day in their system of time keeping (which starts with sundown), maybe not.
Interesting - http://en.wikipedia.org/wiki/Hour - I hadn't considered there might be different ways to do this.

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"Iti sapis potanda tinone" Lycophron

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Doublethink.
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Has anyone else noticed their freeview reception getting worse since the most recent reordering of the digital channels ?

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All political thinking for years past has been vitiated in the same way. People can foresee the future only when it coincides with their own wishes, and the most grossly obvious facts can be ignored when they are unwelcome. George Orwell

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Drifting Star

Drifting against the wind
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Ours is always excellent on one TV and varies from bad to appalling on the other, and I haven't noticed a change on either.

Last night, though, one of the TVs told me that there is a further reshuffling at the beginning of October, so that might well suggest that there are some problems after the previous rearrangement.

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The soul is dyed the color of its thoughts. Heraclitus

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Tukai
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quote:
Originally posted by Jengie Jon:
The answer maybe because that is the way William Playfair did it.

Jεngiε

x-y co-ordinates go back to Descartes (17th century), which is why they are also called Cartesian co-ordinates. And he plotted y as a function of x (i.e. y dependent , x independent).

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A government that panders to the worst instincts of its people degrades the whole country for years to come.

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Albertus
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Quick one- how do I permanently alter my Facebook settings so that my posts never show my location? Is this possible at all? Thanks.

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My beard is a testament to my masculinity and virility, and demonstrates that I am a real man. Trouble is, bits of quiche sometimes get caught in it.

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Adam.

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There may not be a simple answer to this question, but do detectives really just work one case at a time? Almost every cop show seems to present it like that.

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Ave Crux, Spes Unica!
Preaching blog

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Lamb Chopped
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IANA detective, but I really, really doubt it. There have to be long delays where you're waiting for a witness to get back into the country, or out of the hospital; or for test results to come back; etc. etc. etc. You'd be working your other assignments at those times.

[ 01. October 2014, 01:54: Message edited by: Lamb Chopped ]

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Er, this is what I've been up to (book).
Oh, that you would rend the heavens and come down!

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lilBuddha
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quote:
Originally posted by Hart:
There may not be a simple answer to this question, but do detectives really just work one case at a time? Almost every cop show seems to present it like that.

It is hugely variable depending on the location, type of crime, personnel available, etc. Anywhere from one case for months to multiple.
The telly gets so much wrong.

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I put on my rockin' shoes in the morning
Hallellou, hallellou

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jedijudy

Organist of the Jedi Temple
# 333

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Dear S-i-L had a stack of five cases (last we talked about that), and he's still in training! (He's liking the detective gig...he gets to actually eat lunch now, unlike most of the time he was a road deputy!) [Big Grin]

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Jasmine, little cat with a big heart.

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Ariel
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quote:
Originally posted by Albertus:
Quick one- how do I permanently alter my Facebook settings so that my posts never show my location? Is this possible at all? Thanks.

Mine never show my location. Did you type yours in at some point? Or are you posting from a phone which has GPS enabled?
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Albertus
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No, don't think I ever did type it in, and I usually post from the laptop on my desk. That's why I'm puzzled it comes up. I don't particularly mind when I'm at home, but I don't necessarily want to advertise it if I am away.

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My beard is a testament to my masculinity and virility, and demonstrates that I am a real man. Trouble is, bits of quiche sometimes get caught in it.

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Matt Black

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OK, another techie question: I just manually upgraded by Galaxy S4 Mini from Jellybean to Kitkat via my PC using the Odin firmware patch. It flashed up an error during installation but it seems to have 'taken', save for the fact that the Wi-Fi setting seems to be disabled. Any ideas?

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"Protestant and Reformed, according to the Tradition of the ancient Catholic Church" - + John Cosin (1594-1672)

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Martin60
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HELP! There was a British sci-fi mini-series in the naughties that I never saw because I was always SODDING working or drinking and it had a Russian / Soviet angle and possible had Red in the title and probably not and it DIDN'T have Robson Green in it and I thought it did ... DING!!!! Oktober.

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Love wins

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Martin60
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'98 Stephen Tompkinson

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Love wins

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Martin60
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Thank you SO much!

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Love wins

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bib
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# 13074

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Can anyone tell me what is meant by the instruction I hear on the radio "download podcasts, represent as blogs" because I am so computer illiterate that I find the instruction to be meaningless.

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"My Lord, my Life, my Way, my End, accept the praise I bring"

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LeRoc

Famous Dutch pirate
# 3216

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quote:
Martin PC not & Ship's Biohazard: Thank you SO much!
You're welcome [Confused]

(Glad you found it.)

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I know why God made the rhinoceros, it's because He couldn't see the rhinoceros, so He made the rhinoceros to be able to see it. (Clarice Lispector)

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Penny S
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# 14768

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I have a laundry problem. On turning out my airing cupboard to admit the plumber, I found that some nice pillow cases I had brought from my Dad's place, and which looked fine when I put them in there, had developed patches of yellow stain where he put his head. I have been trying to remove them, firstly by my usual method of spraying with a stain remover, then soaking with Biotex, then washing (in this case the hottest synthetic wash) with a boost of a powder oxygen stain remover halfway through. A lot went, but not all, so I repeated the process. I hung them out to dry, but there was still a stain visible, very pale. So I tried another stain remover, rinsed, and as it hadn't worked, went for a peroxide liquid bleach and another wash. And then repeated that. I was able to give them a little sun yesterday, but had to bring them in wet and leave them overnight. Hung them in the sun again today, looking nearly like an old Persil ad, only to find that two had developed new pale yellow stains in different places as if they have travelled as in chromatography - the one at the bottom has clear signs of the creases from last night's resting wet. I washed them again, with yet another so-called stain remover - went to hang them out, and saw that the stains were still visible, and the others on the line had developed them too.
Four of the pillow cases have embroidered lily of the valley on them, my mother's favourite flower, so chlorine bleach isn't an option.
Any ideas?

[ 05. October 2014, 15:49: Message edited by: Penny S ]

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Jengie jon

Semper Reformanda
# 273

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quote:
Originally posted by LeRoc:
quote:
Martin PC not & Ship's Biohazard: Thank you SO much!
You're welcome [Confused]

(Glad you found it.)

Rubber Duck Problem Solving

Jengie

--------------------
"To violate a persons ability to distinguish fact from fantasy is the epistemological equivalent of rape." Noretta Koertge

Back to my blog

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Moo

Ship's tough old bird
# 107

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Cloth that is wet with peroxide should not be exposed to light until it dries. Otherwise, you end up with yellow stains. (I learned this the hard way.)

Moo

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Kerygmania host
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See you later, alligator.

Posts: 20365 | From: Alleghany Mountains of Virginia | Registered: May 2001  |  IP: Logged
Penny S
Shipmate
# 14768

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quote:
Originally posted by Moo:
Cloth that is wet with peroxide should not be exposed to light until it dries. Otherwise, you end up with yellow stains. (I learned this the hard way.)

Moo

Thank you - serious rinsing follows. The cloth should have been rinsed adequately in the machine, I would have thought. And I think the manufacturers of the liquid peroxide bleach, and the other oxygen generating stuff should mention it on their packaging!
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Penny S
Shipmate
# 14768

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So, the manufacturers of Ace say don't let the stuff dry on the fabric or damage will follow, and Waitrose, on their own brand, add to that not to expose it to direct sunlight. The damage is not, in either case, specified. But I was careful about that. I don't even use delayed washes when I use the stuff, things start in the wash immediately. So there is the detergent phase, and the rinses as well before things go out on the line. Moreover, there wasn't direct sun, as the line was to the west of a three storey terrace, and the worst staining appeared before the sun got round there. (There would have been scattered UV and blue, which I was counting on for sun bleaching.) If this is peroxide damage, it's had to work really hard to do it.
Double rinsing hasn't removed the marks. I'm drying indoors now. They are much better than when I started with dark head stains, quite faint really. And they hardly show indoors. (I'm trying to convince myself.)
I've one inner case which I can experiment on with some last possibilities.

[ 06. October 2014, 08:14: Message edited by: Penny S ]

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Moo

Ship's tough old bird
# 107

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Since the stains are from hair oil, you might try a degreasing spray as a last resort. Then wash as usual.

Moo

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See you later, alligator.

Posts: 20365 | From: Alleghany Mountains of Virginia | Registered: May 2001  |  IP: Logged
L'organist
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# 17338

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The other thing to try might be a specialist stain remover they make for getting rid of sun tan lotion marks?

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Rara temporum felicitate ubi sentire quae velis et quae sentias dicere licet

Posts: 4950 | From: somewhere in England... | Registered: Sep 2012  |  IP: Logged
Penny S
Shipmate
# 14768

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I think the degreasing has happened - I wish that the makers of stain removers would put the ingredients on the bottles, but one of them has a distinct smell of citrus, which goes with that sort of thing. And they've had enough detergent. Also, I don't think the stain was hair oil, since my own under covers can get the same - I think it's people oil! (Or saliva, or - I don't want to go there.) However, tanning lotion remover sounds a good addition to the collection of advice I'm getting - pet stains is another. One of the bottles says it will do those, but seems to have been able to determine that these were not from pets! I have a paste from Lakeland which claims to do "reappearing" stains, which I haven't tried yet.
I tried looking through an illuminated magnifier to see what the stains looked like - but the light failed! It did, however, look as if the actual fibres have changed colour, which is not good.
I wish I hadn't let them sit wet overnight - that seems to have been when the damage was done, with the stain moving about.

[ 06. October 2014, 19:14: Message edited by: Penny S ]

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Penny S
Shipmate
# 14768

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A curious day. This morning I took the test case and applied Lakeland's White Wonder (which made no difference) and on taking it back to hang up with the other cases in the front bedroom with the sun shining through the double glazing, noticed that on the others the stains appeared to have gone, except on a part of a case which was in shadow. So I put that in the light. I couldn't see any other stain, but the test one. Hurray! Then, this afternoon, I had another look, and the stains were back, in the daylight. Now, under energy saving bulb light, I have to look really hard. And still can't see them.
So I've got invisible stains...unless viewed in daylight (not sun indoors). And they're on pillow covers. Hmmm.

[ 07. October 2014, 18:32: Message edited by: Penny S ]

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monkeylizard

Ship's scurvy
# 952

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Whatever you do....don't get a blacklight..... [Smile]

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The ultimate result of shielding men from the effects of folly is to fill the world with fools. ~ Herbert Spencer (1820 - 1903)

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