Printed matter

Details Printed matter Printed matter

1992-02-21

1993-03-23

Yarbrough, Amelia Burgess

Stock material or miscellaneous articles

Article having latent image or transformation

106 21, 283 90, 427145, B44F 110

Patent

active

051962438

ABSTRACT:
Printed matters are disclosed, which are printed with the coloring ink that is able to do the short-time fading at which time the color is losen of itself in a relatively short time after once having developed color by interacting with the coloring assistant containing the pH-adjusting agent which loses effect with the passage of time due to the volatility or the desiccation, and further that is able to redevelop color and repeat the above-mentioned short-time fading each time when the above-mentioned coloring assistant is made to act thereon a plural number of times; and which printed matters are suitably used for printing invisibly, for example, the spaces for answers being to stand abreast of the visibly printed spaces for questions in question books.

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Derwent Abstract Accession No. 87-012235/02, Japanese Patent No. J61271361, Dec. 1, 1986.

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