Not many people know this(and yes I know this can be easily faked with detergets ect.) But my experience with a lot of liiquid lsd is that the more potent,the more it flouresces in blacklight...like a purplish vial of glowstick juice..and I've seen all colors of liquid lsd,but usually from the alcohol to break it down and the remanants of the breath drops in the droppers that liquid is normally kept in..like sweetbreath...blue,tan,black,red,clear...gotta know your dealer tho..if ya don't trust him,don't do it.