Color changing print

Details Color changing print Color changing print

1991-09-03

1993-06-01

Albrecht, Dennis

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...

106 21R, 428 29, 503206, 503213, 503216, 503217, 503218, 503219, 434 84, 434 98, 446147, B41M 504, B44F 110, G09B 1110

Patent

active

052159566

ABSTRACT:
In the color changing print of this invention, plural areas are printed by using plural types of color changing inks which develop into different colors from the substantially invisible colorless state by reaction with a color changing agent. By the emergence of print from colorlessness and by giving changes in the appearing colors, unexpectedness and entertainingness are provided so that an attractive education may be realized.

REFERENCES:
patent: 3617325 (1971-11-01), Spokes et al.
patent: 3823022 (1974-07-01), Thomas
patent: 4084332 (1978-04-01), Waloszyk et al.
patent: 4162164 (1979-07-01), Lin
patent: 4188431 (1980-02-01), Sokol et al.
patent: 4322466 (1982-03-01), Tomlinson
patent: 4525214 (1985-06-01), Panken
patent: 4714275 (1987-12-01), Engel
patent: 5018974 (1991-05-01), Carnahan

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