Blotting paper
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Blotting paper is a highly absorbent type of paper used to absorb ink or oil from writing material, particularly when quills, dip pens, or fountain pens were popular. It could also be used in testing
Used sheets of blotting paper, with ink stains
Blotting paper on a roll
Two doses of LSD, with a match for scale
Blotting paper holder from Germany, today owned by Museum Europäischer Kulturen, Berlin, Germany
LSD
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Lysergic acid diethylamide, commonly known as LSD and by the nicknames acid and Lucy, is a semisynthetic psychedelic drug derived from ergot, known for its potent psychological effects.
Blotting paper
…however filter paper is usually used for litmus strips, generally to allow for the property of diffusion. Drugs active in microgram range, most notably LSD, are commonly distributed illicitly on blotting paper. A liquid solution of the drug is applied to the blotting paper, which commonly is perforated…
Patient with mydriasis (pupil dilation) due to usage of LSD.
Ehrlich's reagent can be used to test for the presence of LSD in a sample, turning purple upon reaction.
Albert Hofmann in 2006.
LSD tabs (50 mcg) featuring blotter art