Reversal processing of exposed Lippman-emulsions

Details Reversal processing of exposed Lippman-emulsions Reversal processing of exposed Lippman-emulsions

1976-12-03

1979-04-10

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

And serially arranged nonelectrical separator

G03C 550

Patent

active

041486471

ABSTRACT:
A method is described of making reversal images in Lippmann-emulsions wherein the emulsion is image-wise exposed and subjected to a first stage development so that a negative silver image of the original is formed but some silver halide is left in the exposed areas, and then to a second stage development under fogging conditions to develop said residual silver halide in the exposed areas, whereafter the silver developed in said first and second development stages is bleached and the active silver halide then still remaining in the emulsion is converted to form a positive image.

REFERENCES:
patent: 3617282 (1971-11-01), Bard
patent: 3640717 (1972-02-01), Gallet
patent: 3658535 (1972-04-01), Willems
patent: 3779764 (1973-12-01), Moll
patent: 3841877 (1974-10-01), Willems et al.

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