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| Science Forum Index » Chemistry Forum » Blood Cleans-Up Better with Cold Water, Why? |
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| Nehmo |
 Posted: Thu Feb 08, 2007 12:45 am |
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Guest
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Why does cold water "dissolve" or clean-up blood better than warm or
hot? For example, if you drip some blood on a white cotton shirt, you
can clean the mishap it if you get to it soon enough and use _cold_
water. If you use hot or warm water, the job is more difficult.
Usually, with a staining agent other than blood, warm water is better
for cleaning. The molecules of water have more motion when the
temperature is higher, and this motion works to dissolve the staining
agent, I speculate. Why is blood different? Are there other substances
like blood in this regard?
--
(||) Nehmo (||) |
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| Joshua Putnam |
| Posted: Thu Feb 08, 2007 1:09 am |
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In article <1170909944.586613.99360@h3g2000cwc.googlegroups.com>,
nehmo54@hotmail.com says...
[quote:4b55a4dffd]Why does cold water "dissolve" or clean-up blood better than warm or
hot? For example, if you drip some blood on a white cotton shirt, you
can clean the mishap it if you get to it soon enough and use _cold_
water. If you use hot or warm water, the job is more difficult.
Usually, with a staining agent other than blood, warm water is better
for cleaning. The molecules of water have more motion when the
temperature is higher, and this motion works to dissolve the staining
agent, I speculate. Why is blood different? Are there other substances
like blood in this regard?
[/quote:4b55a4dffd]
Heat-set dyes attach much better to the fibers of a fabric over a
certain temperature. At low temperatures they just coat the fibers
without strongly bonding to them.
--
josh@phred.org is Joshua Putnam
<http://www.phred.org/~josh/>
Updated Infrared Photography Gallery:
<http://www.phred.org/~josh/photo/ir.html> |
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| Bill Penrose |
| Posted: Thu Feb 08, 2007 1:39 am |
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On Feb 7, 8:45 pm, "Nehmo" <nehm...@hotmail.com> wrote:
[quote:7a23470160]Why does cold water "dissolve" or clean-up blood better than warm or
hot? For example, if you drip some blood on a white cotton shirt, you
can clean the mishap it if you get to it soon enough and use _cold_
water.
[/quote:7a23470160]
Blood cells aren't very sticky, and will wash right out of most
fabrics. Hot water causes blood cells to burst and spread the sticky
hemoglobin around. Hotter water 'denatures' the hemoglobin and clots
it like egg white, so it sticks even tighter.
Plain water alone will eventually burst the blood cells. Seawater or
salt water with 1% or more salt in it will prevent cell bursting and
help them wash out.
If all else fails, an enzyme detergent will chew up the clotted
protein so the fragments will wash away.
Dangerous Bill |
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| Androcles |
| Posted: Thu Feb 08, 2007 1:44 am |
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"Nehmo" <nehmo54@hotmail.com> wrote in message news:1170909944.586613.99360@h3g2000cwc.googlegroups.com...
[quote:d1eb3e080e]Why does cold water "dissolve" or clean-up blood better than warm or
hot? For example, if you drip some blood on a white cotton shirt, you
can clean the mishap it if you get to it soon enough and use _cold_
water. If you use hot or warm water, the job is more difficult.
Usually, with a staining agent other than blood, warm water is better
for cleaning. The molecules of water have more motion when the
temperature is higher, and this motion works to dissolve the staining
agent, I speculate. Why is blood different? Are there other substances
like blood in this regard?
--
(||) Nehmo (||)
[/quote:d1eb3e080e]
Blood contains iron which gives it its red colour (rust).
Oxygen attaches to the iron for transport around the body.
http://en.wikipedia.org/wiki/Hemoglobin
Hot water will break down the haemoglobin, cold water
does less damage. |
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| imascot |
| Posted: Thu Feb 08, 2007 9:00 pm |
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"Nehmo" <nehmo54@hotmail.com> wrote in
news:1170909944.586613.99360@h3g2000cwc.googlegroups.com:
[quote:b1b402024f]Why does cold water "dissolve" or clean-up blood better than warm or
hot? For example, if you drip some blood on a white cotton shirt, you
can clean the mishap it if you get to it soon enough and use _cold_
water. If you use hot or warm water, the job is more difficult.
Usually, with a staining agent other than blood, warm water is better
for cleaning. The molecules of water have more motion when the
temperature is higher, and this motion works to dissolve the staining
agent, I speculate. Why is blood different? Are there other substances
like blood in this regard?
--
(||) Nehmo (||)
[/quote:b1b402024f]
Blood contains protein, and hot water cooks the protein onto the fabric.
J. |
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| Usenet2007@THE-DOMAIN-IN. |
| Posted: Fri Feb 09, 2007 10:50 pm |
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In article <FIPyh.14174$G5.9560@newsfe11.lga>,
imnot@mycomputer.now says...
[quote:920813a1dc]"Nehmo" <nehmo54@hotmail.com> wrote in
news:1170909944.586613.99360@h3g2000cwc.googlegroups.com:
Why does cold water "dissolve" or clean-up blood better than warm or
hot? For example, if you drip some blood on a white cotton shirt, you
can clean the mishap it if you get to it soon enough and use _cold_
water. If you use hot or warm water, the job is more difficult.
Usually, with a staining agent other than blood, warm water is better
for cleaning. The molecules of water have more motion when the
temperature is higher, and this motion works to dissolve the staining
agent, I speculate. Why is blood different? Are there other substances
like blood in this regard?
--
(||) Nehmo (||)
Blood contains protein, and hot water cooks the protein onto the fabric.
[/quote:920813a1dc]
Remember that weird US TeeVee advert from the mid-80s, about this
subject?
"XYZ Laundry Pre-Treat has protein. And protein gets out
protein." The examples included blood stains.
I never did figure that one out.
--
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http://www.TheFreeStuffList.com/
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| Bob |
| Posted: Sat Feb 10, 2007 1:20 pm |
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On Fri, 9 Feb 2007 18:50:36 -0800, Usenet2007@THE-DOMAIN-IN.SIG
<Usenet2007@THE-DOMAIN-IN.SIG> wrote:
[quote:257bd7fa5c]
Remember that weird US TeeVee advert from the mid-80s, about this
subject?
"XYZ Laundry Pre-Treat has protein. And protein gets out
protein." The examples included blood stains.
I never did figure that one out.
[/quote:257bd7fa5c]
It may have related to including proteases in the detergent.
bob |
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