From the 4-AcO-DMT thread: This reminds me: I have a friend who's color-blind as well, and he always claimed to me that he saw colors only when he did mushrooms (he doesn't do Research Chemicals of any stripe). I've never heard of this with any other drug— I wonder if DMT (be it 4-HO, 4-PO, 4-ACO or what have you) (or maybe 5-MeO or N-N-Naked too?) commonly produces this effect in the color-blind. Or if any other tryptamines do. Or psychedelics of any family. There have to be some color-blind DF members; any data to share?