System for inkless fingerprinting

Details System for inkless fingerprinting System for inkless fingerprinting

1994-06-30

1995-10-31

McMahon, Timothy M.

Coating apparatus

Body member printing type

427 1, 427150, 503213, 503221, 503225, B41K 136

Patent

active

054625971

ABSTRACT:
A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition comprising a leuco color-former coupound, a dialkyl phthalate wherein the alkyl group contains 1-3 carbon atoms, a substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color developing substance comprising a phenol/aldehyde condensation product produced by the reaction together of an alkyl-substituted salicylic acid, an alkyl-substituted phenol, and an aldehyde, said condensation product having been reacted with a metal source.

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