RE: More glyoxal hardener in gel sizing observations

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From: Kerik Kouklis (Kerik@Kerik.com)
Date: 12/15/02-11:57:35 PM Z


> but whatever yellow occurs will disappear with a long soak in water

No, that is not necessarily true. In fact, once the yellowing of the glyoxal
has occured, I have not been able to remove it at all (long soaks,
metabisulfite, hypoclear, acid baths, 80 grit sandpaper, jackhammer...)

I find if I print on the glyoxal-hardened paper before the yellowing has
occured, then it doesn't happen. Once the yellow is there, it's there for
good. (I am mostly using Fabriano Uno and Whatman's printmaking paper;
glyoxal mixed in w/the sizing in one step.)

> In any event, I wouldn't return to formaldehyde
> including because it stains more than glyoxal (in my tests).

Are you talking pigment stain or this yellowing effect? If you mean pigment
stain (and I think you do) I would completely disagree. If anything, in my
tests, formaldehyde hardens more than glyoxal (ie less tendency to stain),
although I have no problems with staining with either hardener.

Kerik


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