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Green’s Dictionary of Slang

windowpane n.

also pane, window glass, windowpane acid

[a small square of gelatine impregnated with LSD]

1. see window n. (1)

2. (drugs) a variety of LSD.

1976		M. Arble Long Tunnel 150: We had some dynamite THC last week, and some great windowpane acid.
1978		L. Kramer Faggots 301: You name it, somebody’s on it. [...] Coke, Window Pane.
1981		D.E. Miller Bk of Jargon 339: windowpane: Small, transparent LSD dose to be dissolved on the tongue.
1982		AS LVII:4 289: When LSD is mixed with other drugs [...] [s]uch mixtures are today called [...] window glass.
1991		B. Hamper Rivethead (1992) 19: We ate acid at every opportunity [...] stoned to the gills on orange barrel mescaline or windowpane acid.
2000		C. Cook Robbers (2001) 346: Goes back to the Haight-Ashbury and a windowpane of acid in Golden Gate Park.
2001		ONDCP Street Terms 16: Pane — LSD. [Ibid.] 22: Window glass [...] Window pane – LSD.
2001		YellowRoomNet Archive 28 Apr. 🌐 L-S-D. L-B-J took the I-R-T down to 4th Street U-S-A / When he got there, what did he see? / The youth of America on L-S-D... / purple micro dot windowpane, mellow and gentle. Perfect for my ‘trip’ to Disneyland in 1983.