Green’s Dictionary of Slang

(drugs) Tuinal, a barbiturate.

1969		R.R. Lingeman Drugs from A to Z (1970).
1971		E.E. Landy Underground Dict. (1972).
1981		D.E. Miller Bk of Jargon 338: reds and blues: Barbiturates (Tuinals).
2001		ONDCP Street Terms 18: Red and blue — Depressants.