Image amplification of negative-working diazo materials

Details Image amplification of negative-working diazo materials Image amplification of negative-working diazo materials

1975-10-23

1978-06-13

Bowers, Jr., Charles L.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 27R, 96 47, 96 68, 96 75, 96 91R, 96 91D, G03C 534, G03C 518, G03C 520

Patent

active

040946819

ABSTRACT:
A method for the amplification or intensification of dye images formed in a negative-working diazo system which comprises the steps of: (1) initially image-wise exposing a negative-working diazo layer to actinic radiation sufficient to convert a portion of the diazo compound contained therein to an active coupling constituent in the light-struck areas to form a first latent image, (2) developing the exposed diazo layer to effect coupling so as to form colored incipient images in the light-struck areas, (3) exposing the entire diazo layer from the same side as the initial image-wise exposure to actinic radiation of a greater amount than that used in the initial exposure, said amount of actinic radiation being sufficient to substantially photolyze the non-image areas while simultaneously creating second latent images beneath the already-developed areas, and (4) developing the exposed diazo layer again to effect coupling in said second latent image areas to form color therein and to amplify the initial colored incipient images. Further amplification may be obtained by exposing the diazo layer from the side opposite that of the initial exposure and again developing to effect coupling of any remaining diazo under the original dye image areas.

REFERENCES:
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patent: 3663228 (1972-05-01), Wyckoff
patent: 3713825 (1973-01-01), Girard
Kosar; J., "Light-Sensitive Systems," J. Wiley & Sons, 1965, pp. 267-272.
Anon, Research Disclosure, 10/1972, pp. 58-62.

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