COLOR-FORMING DUPLICATING METHOD

摘要

Hectograph duplication is carried out by bringing a master sheet carrying a predetermined pattern of images which is formed with an image-forming material consisting essentially of a colorless color forming compound selected from N-bis(p'-dimethylaminophenyl)methyl-m-hydroxymethyl-aniline and N-bis(p'-dimethylaminophenyl)methyl-p- beta -hydroxyethyl aniline and a vehicle into contact with a copying sheet coated with a reactive solid material effective for developing the colorless color forming compound after wetting the coated surface of the copying sheet with a volatile neutral organic liquid capable of dissolving the colorless color forming compound but not capable of adversely effecting the reactivity of the reactive solid material, and developing the colorless color forming compound transferred onto the coated surface of the copying sheet so as to produce violet blue images.