Intensifier for Dry Plate emulsions

Hello, I've been looking for a non-mercury based intensifier for a simple potassium iodide-bromide silver gelatin emulsion. Would anyone have any formulas for that or know where I could look. I've found more information about intensifiers for wet plate could those also work for silver gelatin? Thanks

The Darkroom Cookbook has information. Selenium is probably the easiest. If you are unfamiliar with intensification, you should know it's not a miracle cure for thin negatives. It mostly increases contrast. Plain silver negatives are already on the high contrast side, even when they are thin. Intensification won't give you shadow detail that isn't there to start with. If you are scanning your plates, a good scan will "see" more detail than you might guess, and a thinner negative is actually a better candidate for scanning. From there, it's your choice of a virtual print, an inkjet print, or a digital negative for contact printing. If you want to make a straight-from-the-plate contact print, that's trickier, but Ilford Multigrade has rescued untold non-perfect negatives, especially if you have a variable contrast enlarger as your light source. Good luck.

I'd have thought a Chrome intensifier might be good because the bleach is also a powerful emulsion hardener and that would help any softening that occurs during the Intensification. It's also more powerful than using Selenium toner.

I've always used Ilford In-3 which is in the DCB, although Ilfrord published it as a two part version using Part B as a 10% HCl (Hydrochloric Acid) rather than mixing each time with concentrated acid. It's pretty much the same as the bleach used in Ilford IT-8 toner which uses a simple Pyrocatechin re-developer, I use Pyrocat HD at 1+1 to 25 this adds a bit more intensification. This way you get the Intensifying effect of the Chromium as well as the staining from the Pyrocatechin. IT-8 is the only toner I know that intensify prints.

Ian