Quote Originally Posted by superloaf View Post
and is the main purpose of the stain to mask the grain?
No, many are using Pyrocat to produce negatives for alternative processes and the stain amplifies the silver image. This is what Sandy King designed the developer for as well as for dual use to produce negatives that will print on normal bromide, bromo-chloride etc papers.

Going back to Patrick Gainers comment "You can't just choose a developer and say "Grain, begone!" and have it actually happen." and your own comments about Rodinal. Some love Rodinal others hate it, but it is capable of producing excellent negatives (35mm and upwards) and prints which have good tonality and sharpness alongside fine grain. but Rodinal works best with modern films like APX100 and Tmax100, and the results from 35mm film are superb.