Ink and method for the development of concealed iamges

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

1991-02-05

1992-01-28

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

Having a colorless color-former, developer therefor, or...

Method of use, kit, or combined with marking instrument or...

503200, 503202, 503217, 503225, B41M 5155

Patent

active

050844342

ABSTRACT:
Disclosed is a system for developing latent images on alkali-based or acid based paper stock which has 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

REFERENCES:
patent: 3451143 (1969-06-01), Thomas et al.
patent: 3620744 (1971-11-01), Schellenberg et al.
patent: 3632364 (1972-01-01), Thomas et al.
patent: 3788863 (1974-01-01), Scheuer
patent: 4051283 (1977-09-01), Thomas et al.
patent: 4853321 (1989-08-01), Momoki et al.

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