LSD is usually found on “blotter” paper (paper that is perforated into small squares). The squares or “tabs” may be colored or have images printed on them. Liquid LSD is a clear liquid, usually in a small container, tube or flask. LSD can also be found in thin squares of gelatin.ome LSD users experience flashbacks, recurrence of certain aspects of a person’s experience even if the user doesn’t take the drug again. A flashback occurs suddenly, often without warning, and may occur within a few days or more than a year after LSD use.