From: Katharine Thayer (kthayer@pacifier.com)
Date: 07/20/02-11:16:41 AM Z
Judy Seigel wrote:
>
>
> various sulfites & -ates will clear a dichromate stain, & maybe could also
> soften top layer for removal. But they're likely to make you cough (or I
> find them so).
The "various sulfites and sulfates" which clear dichromate stains have
different qualities, being different compounds, and while they may be
roughly interchangeable for the purpose of clearing dichromate stains,
they are not interchangeable in all respects. Sodium bisulfite, by many
accounts, is the strongest and most likely to soften and lift the
hardened gum, which is why I recommended it for Cor's purpose of gum
removal, and why something like potassium metabisulfite, which removes
dichromate stains but isn't so likely to disturb the hardened gum, would
not be useful for Cor's purpose. Sodium bisulfite, having rather strong
fumes, should be used outside or in a well-ventilated area.
Katharine Thayer
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