Yes, a blacklight can be used to tell the quality of the acid being eaten. I've looked all over the internet for this information and haven't found shit. A friend of mine was telling me about this acid I bought, which he called white lavender. He showed me when the acid was put under a blacklight the acid turned a pale white with blue and purple colors in it. I took it and I had the best trip of my life. Anyone know any information about this, some say its not true but it certainly is.
Looks like I need to get a portable black light. So, that whenever I go to pick up acid, I can shop around first, lol.