1 envelope of "Cyko Prints at Night", a high contrast developing paper "made for brilliant and contrasty(sic) effects". Package contains 1 dozen papers for 3 1/4 x 4 1/4 prints. Includes a folded piece of paper with instructions, and a receipt for the purchase of 2 photographic postcards at Ruth Ingram Antiques in Unionville, Ont dated July 2, 1973. Stamp on back of envelope gives date as Sept 1, 1918, which could indicate the develop-by date rather than the date of manufacture.