U of S | Mailing List Archive | alt-photo-process-l | RE: Hardening With Glyoxal: One Shot?

RE: Hardening With Glyoxal: One Shot?



Loris,

A strong solution of sodium hydroxide will help loosen the hardened gelatin
if left to work over night. Be prepared to scrape the gelatin though.
Straight chlorine bleach will work too and is probably safer.

Don
 

-----Original Message-----
From: Loris Medici [mailto:mail@loris.medici.name] 
Sent: Monday, May 07, 2007 2:04 AM
To: alt-photo-process-l@usask.ca
Subject: RE: Hardening With Glyoxal: One Shot?

Indeed, I had to throw away the vessel which I put the gelatine + hardener
solution when I tried to get it out of the the fridge and reuse
:) I couldn't struggle to scrape it - buying a new vessel was easer :)

Regards,
Loris.

-----Original Message-----
From: Don Bryant [mailto:dsbryant@bellsouth.net]
Sent: Monday, May 07, 2007 8:55 AM
To: alt-photo-process-l@usask.ca
Subject: RE: Hardening With Glyoxal: One Shot?


Michael,

Nope! Once the gelatin cools and hardens the mix cannot be re-used.
Chris Anderson notes on page 44 of her book 'Alternative Processes
Condensed', that Kerik Kouklis adds 6 drops of formalin to 10 ml of size
to cover a 14x17 area. Perhaps this would work with glyoxal also, though
I'm not clear how Kerik is able to mix the hardener uniformly in such a
small volume of gelatin.

Don Bryant


-----Original Message-----
From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca] 
Sent: Monday, May 07, 2007 2:31 AM
To: alt-photo-process-l@sask.usask.ca
Subject: Hardening With Glyoxal: One Shot?

I'm mixing small batches (100 ml) of 3 per cent Knox with 2.5 mls of
Glyoxal (oh, and a splash of rye whiskey for bubbles) for sizing paper
with a sponge brush. Can I reuse this mixture by simply reheating in the
microwave after it cools and gels overnight? Is there a shelf life? Thx.