| 摘要 |
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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