Re: glyoxal yellowing - is this old news?

[Sandy King <sanking@clemson.edu>]

Title: Re: glyoxal yellowing - is this old news?

Clay,

I have seen yellowing of the sizing of papers hardened with glyoxal on several occasions. For that reason I now avoid the use of glyoxal and use chrome alum instead.

In some cases the yellowing may be reversible as someone suggested at one time during a similar thread.  I don't recall exactly their recommendation but you might try a 3% solution of sodium bisulfite or potassium metabisulfite if you have one of these on hand. Just let the print soak in the solution for 5-10 minutes and then wash in running water for another 5-10 minutes. This is the procedure I follow to eliminate the yellowing of carbon prints developed on paper that results from bichromate leeching into the paper.

Sandy K.

> I just pulled out a palladium print
> that I had sized after printing about a month ago, but had forgotten
> to finish with a gumover layer. The sized area had yellowed
> tremendously! Has anyone had any a problem with the paper yellowing
> after sizing with gelatin and glyoxal? I seem to recall some
> discussion of this a while back, but can't find the exact thread. Does
> chrome alum resist yellowing better? And where do you get chrome alum?
> Neither B&S, Artcraft, or the Formulary carry it, at least on
> their web pages.
>
> Thanks for any help.
>
>
> Clay

--