I have never heard of red amidol. Where do you get it? I recently purchased some amidol from Photographer's Formulary, and its quality was not what I would prefer, though it is useable. It reminded me why I had switched to using amidol from Bryant Labs in Berkeley (1101 Fifth St., 510-526-3141 or 800-367-3141). The amidol from PF is dark grey and a bit chunky, whereas the amidol I purchased from Bryant was a nearly white crystalline powder, which kept well for more than two years. The Bryant Labs stuff is more costly--I don't know if it is still available or not, but it is of a superior quality.(posted 8244 days ago)Off-subject comments: Bryant has a good price on gold chloride, but most of their other stuff is expensive. I recently purchased some potassium dichromate from Photographer's Formulary and had the opportunity to compare it to that from Bryant. The stuff from Bryant was milled to homogeneous-sized grains that poured smoothly from the container without scattering, whereas the stuff from Photographer's Formulary contained all different sizes of crystals which tended to bounce and scatter when I poured it from the container. Every time I use this new stuff from PF it makes a big mess, which I must carefully clean up because of the extreme toxicity, corrosiveness, and oxidation potential of potassium dichromate. I much prefer the more uniform product from Bryant Labs. This isn't to denigrate Photographer's Formulary in any way--they offer a great service to darkroom enthusiasts, but when dealing with chemicals like potassium dichromate I think I will go with the more expensive brand.