John, take a look at David Vestal's book, The Craft of Photography. He talks about Kodak Chromium Intensifier as giving a wide intensification latitude. You bleach the film and then redevelop it in the light, taking it out a bit before it reaches a good density. I'm dying to see how well this works. But for all I know, this technique may be way outdated- the book was written in the 70's.(posted 8450 days ago)