hectograph
printing process that involves transfer of an original, prepared with special inks, to a pan of gelatin or a gelatin pad pulled tight on a metal frame
en-US/ˈhɛktəˌɡɹæf/
en-GB/hɛktəʊɡɹɑːf/
printing process that involves transfer of an original, prepared with special inks, to a pan of gelatin or a gelatin pad pulled tight on a metal frame