Quote Originally Posted by vedmak View Post
if the question is clear tonal separation in extreme lighting conditions, pyro developers will blow the socks off the stand development. In one of his books saint Ansel had a picture of a light bulb developed in pyro developer, try to do that one on a working light bulb with Xtol
Be careful when using the word "pyro". There are two basic "pyro" developers. One is pyrogallol or pyrogallic acid which is the more toxic and active of the two. the other is pyrocatechol or pyrocatechin which is somewhat less toxic.

The Adams image you mention was developed in a very highly diluted pyrocatechin developer which is a highly compensating developer.