Crayon adapted for development of latent images

Compositions: coating or plastic – Coating or plastic compositions – Corrosion inhibiting coating composition

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106 21, 106 26, 106 31, 106 27, 106266, 106193R, 106194, 427150, 346200, C09D 1100, B41M 312, B41L 120

Patent

active

045252149

ABSTRACT:
A latent image development system comprising a substrate having a latent image thereon and an instrument for dispensing a color developing agent over the image. The image contains a carboxylic or organic sulfonic acid salt of zinc, mercury, copper, iron, cobalt, aluminum or titanium and a binder for the salt. The dispensing instrument contains diiphenylcarbazone or a ring substituted diphenyl carbazone derivative.
Also disclosed are a crayon for use in developing a latent image, an ink for producing the latent image, a method for producing the crayon, and a system for use in printing and developing a latent image system.

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