TiHKAL · info is a visual index and map of “ TiHKAL : The Continuation ,” by Alexander & Ann Shulgin. In TiHKAL the authors continue their exploration (begun in “ PiHKAL : A Chemical Love Story ”) of the chemistry and transformative power of psychedelic drugs, devoting this volume to tryptamines, β-carbolines, and LSD analogues.

TiHKAL (the book) contains detailed reports on 55 substances and perhaps a hundred more are touched on. Still other tryptamines not discussed in the book are known or are suspected to have psychedelic potential. TiHKAL · info is my attempt to map out the terrain.