From: Ted Edkins (tedkins@cygnus.uwa.edu.au)
Date: 12/06/01-06:41:45 AM Z
The compound is potassium chromium sulphate and is often sold as the
dihydrate.
According to Scopick's book The Gum Bichromate Book the compound is a
better hardener than potassium alum ie potassium aluminium sulphate but
dosen't keep as well.
Judy, glyoxal should keep better at a lower temperature than room temp so a
frig is useful. Another possibility is to add some sodium bicarbonate to
reduce the acidity. Add the sod bicarb until the fizzing stops.
Ted Edkins
At 10:34 AM 12/6/01 +0100, you wrote:
>Can anybody tell me what the chemical formula is of this hardener ?
>
>Witho
>
>
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