Quote Originally Posted by donbga View Post
Have you tried printing pure platinum prints that are brush developed in glycerin and potassium oxalate? This procedure is described in Sullivan & Weese's New Platinum Print. The method works very well. However it's a bit too expensive for my wallet, I've only made 3 pure platinum prints with that technique.
From your description this sounds like how the early platinotype printers used to control contrast. Developer temperature effects development time. By using a cool developer with glycerin on the print and in the developer they could really slow down the development time which allowed them to control local contrast with a brush. It's very effective, although for most purposes it's easier to use a dash of potassium dichromate coupled with some judicious dodging and burning.