Re: [Histonet] a much easier chemistry question
Hasn't anyone tried Oxy Clean? I even use it on my white show dogs (then
a little bit of Downy in the rinse water to make their coats soft). They
smell good, too.
Sent by: firstname.lastname@example.org
11/05/2004 11:36 AM
Subject: Re: [Histonet] a much easier chemistry question
Years ago, Scientific Products made a lanolin-based cream stain remover
that worked great in removing biological stains. It worked like magic
on stain on hands and lab surfaces. One day, out of frustration, I
tried it on my white lab coat (stained with methylene blue) and it
worked fine. I rubbed the cream into the stain, and then washed to coat
in the washing machine... stain all gone! I check a recent (1997)
Allegiance catalog, and they still showed this product. Called
"Dye-Sol" and the catalog number was C6345. All the S/P products are
now carried by Cardinal so you could contact them to see if they still
carry it. They should be able to cross-reference the old Allegiance
Ford M. Royer, MT(ASCP)
Midwest Science Biocenter
John Kiernan wrote:
>Your unsuccessful efforts were all acidic,
>neutral or hydrophobic. Trypan and Evans blue are
>anionic dyes with large, very hydrophilic molecules.
>Alkaline solutions extract anionic dyes, and urea
>(high concentration) can disrupt the non-ionic,
>non-covalent bonding that holds large hydrophilic
>dye molecules to substrates such as cellulose (cotton).
>Try a strong urea solution (8M=48%) made alkaline
>with borax or washing soda. Geoff McAuliffe's
>simpler suggestion of soap and water may work,
>because soap is alkaline.
>Keep us informed. All who use dyes need this sort
>of information. (I have a grey tie with alcian
>blue spots dating from the 1960s; wouldn't want to
>remove them now, though I'm sure it would be
>impossible without dissolving the fabric.)
>Jack England wrote:
>>Here's a much more fun chemistry question for anyone that wants to bite:
>>what is the best method to remove trypan/evans blue from cotton fabric?
>>of my colleagues got some on her pants the other day and asked what the
>>way to get it out was. I did not know, so I put some on cotton gauze,
>>--acid alcohol...faded the stain a little, but didn't get rid of it
>>--DI water...no change
>>--absolute ethanol...no change
>>--ethanol/non-ionic detergent/DI water rinse...no change
>>--citrus oil clearant...no change
>>Given that her fabric is tan (and thus not white, and thus likely not
>>bleach-able), can anyone out there in histo-land suggest a way of
>>de-staining trypan-blue-stained fabric? I've been wondering about this
>>while now and figured I'd pass it around.
>>--Many thanks and aloha to all,
>>Tissue Genesis, Inc.
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