Psychedelia.dk

Two quantities of liquid acid, one strong, one weaker.

The strong one you feel a strong come up at T+30m, likened to a rocketship. The other one kicks in more like an hour and is more mellow.

Is the strength the only thing that's different, or can impurities account for a different, perhaps rougher experience? What's your opinion on so called bad acid?

I think that there are many chemicals that are misrepresented as LSD. that being said, I am going to assume that the two liquids are LSD. Dosage has a lot to do with the onset speed and peak intensity of the trip. I think that one vial is a strong solution and one vial weaker and that would account for the differences.

Now, about "bad acid", the last step in making LSD is the separation of the inactive isomers and impurites from the active isomer d-iso-lysergic acid diethylamide. Only ~30% of the the crude product is LSD, the rest are these[1] inactive isomers and some side reaction products as well. These impurities are only inactive in the brain, they have many effects on the body that contribute to the "body load" or "roughness" of the trip. I am certain that "bad acid" is unpurified crude product, containing a mixture of the aforementioned molecules and LSD. Acid needs to be purified via chromatography twice, once on silica to remove the side reaction products and leftover reactants, and a second time using a chiral substrate to separate the active isomers from the inactive ones. Large, professional labs could easily accomplish this, but smaller, less professional labs might forgo this and create what you call "bad acid".