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Re: Staining with Glyoxal

Sarah Van Keuren wrote:
> 
> > There was a brief exchange on the list a short while back on the
> > problem of staining when hardening with glyoxal. At the time I had
> > not seen the problem and suggested to Judy that the staining might
> > have resulted from other causes. Recent posts on the carbon list,
> > however,  suggest that there is indeed a rather serious problem of
> > staining when hardening papers with Glyoxal. It would be interesting
> > to hear of the experiences of all who have been using Glyoxal in an
> > effort to assess the nature and scope of the problem. There may be
> > other factors that should be mentioned but I would be particulary
> > interested to know the following.
> >
> > 1. Have you had any staining with Glyoxal?
> 
> The one time I tried hardening with Glyoxal the staining was two-fold: a
> yellowish smearing effect and splotchy areas of paper that were made
> transparent as if oiled.
> >
> > 2. What sizing method did you use?
> 
> I used sponge brushes to apply two layers of gelatin to one side of the
> paper. I suspect that I would not have gotten the oiled effect if my paper
> had been immersed in gelatin and thus coated on both sides.
> >
> > 3. Which papers are involved?
> BFK Rives which I've used successfully for over 20 years, hardening the
> gelatin in dilute formaldehyde. I have been using the same gallon of 1:40
> formaldehyde for almost a decade though it is now about half a gallon.
> Glyoxal has to be discarded frequently, I gather.
> >
> > 4. At what point did you notice the stain? (right away, at one month,
> > four months, etc?)
> Right away.
> >
> > 5. Have you found any way of removing the stain, and if so, what?
> I lost interest in using glyoxal, especially since it could be as hazardous
> as formaldehyde and needs to be replaced rather than replenished.
> >
> > Thanks for your comments.
> Please let us know the results of your survey.
> Thank you.
> Sarah Van Keuren
> >
> > Sandy King
> >
> >
> >
> >
> >
All Hail Mighty Formaldehyde!!