In article , Lee Blaver
wrote:

David Micklem wrote:

Actually, Ponceau S (if thats what it is) is used quite a lot in
molecular biology labs because it is an easily _reversible_ protein
stain. Just washes out in water. Slightly acidic works better. And it
may stain rugs better than it stains proteins... Don't know about the
Sunset Yellow though!

David

It's Ponceau 4R, but it's been years since I did organic chemistry, so I
wouldn't have a clue if that makes a difference :-)



Oh well, me neither. As it happens I have an Irn-Bru stain of my own -
carefully dried in by an otherwise excellent lodger several _years_
ago. I might have a stab at it with vinegary water just in case its
similar enough to Ponceau S.

David



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