Writing set

Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Plural colors or plural diverse systems

Patent

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Details

427152, 503201, 503206, B41M 512, B41M 516

Patent

active

047481471

ABSTRACT:
A writing set comprising a combination of paper printed thereon with two or more coloring bands using two or more types of leuco dye which develop different colors and a writing means which contains a solution of acid materials which develops the color of the leuco dyes.
When characters, pictures, etc. are written on the paper, the colorless leuco dyes in the written portion develop color to form colorful characters, pictures, etc.

REFERENCES:
patent: 2714074 (1955-07-01), Green
patent: 3363338 (1968-01-01), Skinner et al.
patent: 3745672 (1973-07-01), Duskin
patent: 3823022 (1974-07-01), Thomas

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