This is terrible advice, that must not be heeded. The times when you could be reasonably sure you are getting LSD if you are getting the drug on blotter, are l

This is terrible advice, that must not be heeded. The times when you could be reasonably sure you are getting LSD if you are getting the drug on blotter, are long gone. There are many drugs that can be/are being distributed on blotter paper. Some of these have a very steep dose-response curve, and can be very dangerous in relatively minuscule amounts. While it's perfectly safe (if a bit reckless) to consume, say, upwards of three hits of LSD on blotter, doing the same with blotters containing 25I-NBOMe or Bromo-Dragonfly could land you in hospital or even the mortuary. Taking psychedelic drugs originating on the black market has, unfortunately, become an intricate game, and you really need to learn the rules before you can play it at least somewhat safely. There is no easy answer, other than doing your research, preferably lots of it.