From: Andre Fuhrmann (Andre.Fuhrmann@uni-konstanz.de)
Date: 02/07/00-04:20:48 AM Z
>On Thu, 3 Feb 2000, Andre Fuhrmann wrote:
>> How much glyoxal would you
>> add, say, to 100ml of a solution of 1:2 (gum : water)? Could you also use
>I used 2 drops per ounce of mixed gum solution.
>> glyoxal as a preservative for vandyke or cyanotype sensitizer to prevent
>> fungus growth? Would that effect the sensitizer badly?
>Folks say they use thymol for cyanotype A solution....(I just pluck out
>the mold, which doesn't come back, BTW), but I never saw fungus on VDB.
>Are you sure that's not Gloy?
Many thanks, Judy. Stefan Oertel, another reader on this list, just told
me that the 0.5% glyoxal will do as a preservative but may not be terribly
effective as a fungicide. I ll continue adding a little bit of dichromate
to Cy-A (or B? ;-) -- that definitely does stop fungus growth. For gum I
ll try 1% glyoxal. Sorry, the bit about VDB sensitizer was just a slip.
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