Re: Seeking Information on 2 problems with Gum process
Would you know how permanent this method leaves the image? Would the reduction continue, or could it be arrested by reapplying acid to it? The acid would make it slightly a different blue in some cases by the way.
It's a very useful way to control cyanotype density if indeed it is permanent.
On Apr 30, 2008, at 9:29 AM, Keith Gerling wrote:
As my well-water is somewhat alkaline, the cyanotype layer bleaches out slightly during the subsequent gum stages. My approach is to overprint the cyano layer to the point where it is much too dark, and then to bleach it back to where I want it when the gum is finished. I use dilute ammonia. On Wed, Apr 30, 2008 at 5:50 AM, cadunn <email@example.com> wrote:Henry wrote: but I found it much better to dilutethe coating solution with anything up to six or seven times its own volume