Carmen,
Try hardening with chromium. I have done it many times (by the way glutaraldehyde works for me as well as glyoxal). I use about 4-6% gelatine solution with some ammonium or potassium dichromate. Unfortunately I do not have my notes with me, but about 20cc of 3% solution per liter would be OK. SOme excess of dichromate is OK. I coat the papers, let them dry and take them outside for 15-20 minutes, then wash them in water. Not much chromium washes out as most of it should be reduced by the sunlight.
Hope that helps.
Marek
From: Carmen Lizardo <carmenlizardo@yahoo.com>
Reply-To: alt-photo-process-l@usask.ca
To: alt-photo-process-l@usask.ca
Subject: Gum print sizing voodoo!! HELP!!
Date: Sun, 06 Aug 2006 14:19:37 -0700 (PDT)
>
>
>Okay, so I have to deliver this print by tomorrow to
>this gallery, and my two year old took a sharpie and
>made a masterpiece out of it…the wonders of
>parenthood…
>
>So I started to make another one, but lord and behold,
>I didn’t have any more sized paper. I decided not to
>panic, and thought that if I work quickly I could size
>a couple of sheets to get me through…but I ran out of
>glyoxal, I started to get teary eyes, when I remember
>I had a bottle of black magic hardener (LPP 92/LPE
>520), which I read on this list, was Gluthardhyde. I
>added 6ml to my 1000 ml of gelatin, coated my paper,
>waited anxiously for it to dry, proceeded to apply my
>first coat of magenta and exposed, but the print never
>develop. Even with a hard water hose nothing washed
>off. I tried this several times, just to make sure,
>and all I have are large magenta rectangles. Its like
>the sizing is holding the pigment in. I even put an
>unexposed (but coated) piece of paper in the water and
>the pigment did not released. And just to make sure
>that the problem was not in the emulsion I coated a
>piece of paper that was hardened in glyoxal and that
>cleared!
>What am I doing wrong? I really need to finish this
>print and my glyoxal is not going to get here on
>time…. Maybe I am not using the black magic hardener
>correctly?
>
>Thank you,
>Carmen
>
>
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