RE: Gum Humidity Question
On Thu, 28 Sep 2006, Keith Gerling wrote:
I suspect, Keith, that this is a very delicate balance.... because my experience (mercifully rare because I don't do your high-humidity act) is that gum emulsion sticking to the negative is exposed, hardened & fairly permanent... tho I probably expose longer than you do, as I like a fairly long development...."4. You don't get emulsion clinging to negative when exposing "quite damp"?" It sometimes happens. I use lith negs. When the negative clings to the print (keep in mind: it hasn't dried because it has only been under glass for 4-6 minutes) I usually rinse it in water. A hassle, but it prevents the dichromate from bleaching the negative.
I haven't forgotten this question & the moment may be soon... as I have cleaned the studio down to bottom layer... the notebook that's supposed to have those notes is.... ta da ! VISIBLE !"PS. I did some tests years ago with additions of ammonia to the gum emulsion, then exposing after a day or even two days. Some of the effects were in fact interesting, but ultimately I decided more trouble than worth for whatever they were." Can you describe the nature of these effects? How much ammonia did you add?