Latent indicia carrier

Details Latent indicia carrier Latent indicia carrier

1975-06-04

1976-11-02

Charles, Lawrence

Printed matter

Calendar

426 77, 426 87, B42D 1500

Patent

active

039892794

ABSTRACT:
A package such as a tea bag has a side surface thereof on which is printed a message. The message is printed with materials that are substantially indistinguishable with the naked eye until a staining agent is activated which selectively stains the package surface but not the indicia thereon to produce a visibly apparent display.

REFERENCES:
patent: 2622471 (1952-12-01), Sparks
patent: 3363336 (1968-01-01), Skinner
patent: 3823022 (1974-07-01), Thomas

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