Ink and method for the development of concealed images

Details Ink and method for the development of concealed images Ink and method for the development of concealed images

C - Chemistry, Metallurgy

09

D

6/24, 42/9

C09D 11/00 (2006.01) B41M 3/00 (2006.01)

Patent

CA 1330705

ABSTRACT Disclosed is a system for developing latent images on alkali-based or acid-based paper stock which had been marked with a water-soluble oxidizing agent to form a concealed image. In the system, a marking composition is applied to said paper stock which comprises (a) A water-soluble iodide, (b) Acetic acid, (c) A water-soluble reducing agent, and (d) Water. Preferably, the reducing agent is ascorbic acid and preferably the marking composition also comprises a water-soluble dye.

613720

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