U of S | Mailing List Archive | alt-photo-process-l | Re: Miracle size for gum

Re: Miracle size for gum

Well that is changing the subject but I wanted to note that what works
best for me is using negatives with a DR of log 1.4, 1.5. I presume
you're using a much stronger dichromate sensitizer than what I do.
Weaker dichromate, stronger DR and longer exposure will probably work
just as well as your setup with the added bonuses: a) Better shadows
differantiation (to me at least) b) Ability to use the same negative
for both gum and cyanotype (moot point for tricolors but very handy
for duotone / tritone work which I mostly do)

Anyway, just wanted to mention. Not that this is something carved on
stone -> but it should be noted that there are other options and


2009/10/10 Marek Matusz <marekmatusz@hotmail.com>:
> ...This one minute thalo test strip
> illustrates it very well. You get a full dark and clear whites with about 6
> steps on the wedge, negative density of about 0.9. This would illustrate
> "gum works best with thin negatives" statement that has been around for so
> long...