I was in the work house with a father and son who were in the same facility as me. the father had been a chemistry prof @ U of minnesota and I think they got busted making it during a holiday break on campus. That was a long time ago so i'm probably off on some of it. I do remember that they were making the gels (think green or purple pyramid or windowpane ) that were what almost all the better acid of the period was. The cleanest I ever got feeling wise was grey blotter though. Really clean stuff~ i'm a mescaline guy now, it's much more "organic" feeling to me. On acid I almost always had a "metallic" feel to it, although that is not a very clear way to describe it.