Instant film unit with coloring means

Details Instant film unit with coloring means Instant film unit with coloring means

1986-07-10

1987-10-20

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Diffusion transfer process, element, or identified image...

430207, 430221, 354304, G03C 554, G03C 300

Patent

active

047013885

ABSTRACT:
A peel-apart instant film unit including two separate sheets comprising a photosensitive sheet and an image-receiving sheet, has a coloring member provided on one end of the photosensitive sheet so as to contact a developer reagent spread between the two sheets for processing. The coloring member is adapted to change in color upon the completion of the processing of the film unit as a result of the chemical reaction of the coloring member brought into contact with the developer reagent. The color change of the coloring member, which is observed from the outside of the film unit, indicates the completion of the processing of the film unit. The coloring member includes a time delay substance that initially separates the reagent spread between the sheets, from the substance that changes color. That time delay substance is permeable by the reagent at a rate such that the reagent reaches that substance and causes the color change only upon the completion of the development of the film unit.

REFERENCES:
patent: 3320065 (1967-05-01), Campbell
patent: 3689269 (1972-09-01), Schieven

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