1317254 Pyrotechnic compositions PAINSWESSEX Ltd 27 May 1970 [10 June 1969 13 Jan 1970] 29457/69 and 1575/70 Heading C1D [Also in Division F3] A flash-producing pyrotechnic composition consists of 55 parts of magnesium powder, 26 parts of potassium perchlorate, 13 parts of barium nitrate, 4...