I was given a large supply of one gallon packets of powdered Microdol-X and a B+W 400 ISO film called "Silvertone". The powder is clean and worked OK on a test roll. I developed it for 12 minutes at room tempertaure at 1:1. I think that this film was made by Agfa, but I'm not sure. Does anyone know who made Silvertone 400 ISO and do you have any suggestions on how to get the best results with Microdol-X? I'm doing mostly street shooting, some informal portraits, urban landscapes, etc. I'm looking for decent resolution, good blacks and shadow details, and a minimal loss of speed.