The blue pigment is in fact evidence of oxidized psilocin, one of the two main psychoactive compounds in a Psilocybe. (The other is psilocybin, which breaks down into psilocin in the body.) To determine if the mushroom in question had purplish-brown or black spores, I began making spore prints. This involves cutting the cap off a mushroom and placing it, gill side down, on a piece of white paper. (Or black paper if you have reason to believe the mushroom has white spores.) Within hours, the mushroom cap releases its microscopic spores, which will form a pretty, shadowy pattern on the paper
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