After the US government made LSD illegal in 1966 people continued to use LSD, but it was manufactured and distributed through underground illegal channels. One popular way of distributing LSD was called “blotter”. It involved saturating absorbent blotting paper with liquid LSD.

Later the papers were perforated along the lines of a grid so that doses could be torn apart easily, and small symbolic pictures were added to the paper to provide clues as to the origin of the LSD that paper contained.

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