PURPOSE: To obtain the subject ink, containing a developer, an ultraviolet light reactive type resin and an oily substance and used for underlay paper, etc., of no-carbon copying paper.

CONSTITUTION: The objective ink containing, e.g. 60-70wt.% developer (e.g. prepared by adding styrene butadiene latices as a binder to acid clay, etc., and dispersing the resultant mixture), e.g. 20wt.% ultraviolet light reactive type resin (e.g. composed of an acrylic oligomer and a monomer) and, e.g. 20wt.% oily substance (e.g. a silicone oil).