Re: bichromate gum
I never buy reagent grade chemicals and do just fine. I also have used all three dichromates and they're all fine except sodium is sooo saturatable that you can mix it over 100% and get a honey like consistency.
Speaking of the painterly approach to gum, one of the highlights of my stay at George Eastman House was seeing prints that had the brushed on colors as you say. One guy did the base exposure in a neutral color (not black, but a greyish putty color mixed from different watercolors) and exposed a lightly pigmented and long exposure layer first to get all the pix detail, then came back in and brushed different colors on in different areas. It was quite fun. I wonder if you couldn't try to do that, and paint your dichromate only layer on top of the putty layer, below and then brush on the different colors hither and thither and then expose?
----- Original Message ----- From: "Don Sweet" <firstname.lastname@example.org>
Sent: Thursday, July 10, 2008 6:48 PM
Subject: Re: bichromate gum
Thanks to Sam, Christina and Judy for the helpful replies.