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 preferences... Regards, Loris. 2009/10/10 Marek Matusz <email@example.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...