Thanks mr. Mowrey, I also suspected ammonia as a cause for the speed increase. I wanted to ask about erythrosine's sensitizing ability - what is its peak wavelength? Also, would a yellow filter work, or is is too far? I'll try immersing the film at time intervals in the dye solution to see what factor does soak time have on the final result. I presume that it would take longer for the dye molecule to enter the emulsion in depth and... attach itself to the agX...when the film has been kept for a long time and probably factory hardened. Burbank suggests a soak time of 60 - 90s, but a fresh emulsion would accept the dye more readily, no?