Abstract This disclosure relates to a method of making a reflex copy of a master by reflex exposing a photosensitive medium comprising a photoconductor sensitized to the reflex light but substantially not sensitive to the light which passes through the said medium from the external light source employed. The photoconductor is rendered chemically reducing when exposed to activating radiation, and is sensitized to the reflex light by uniformly exposing the photoconductor to bandgap light and allowing the activation to decay. Development of the medium after reflex exposure gives a negative image. To obtain a positive image, the developed reflex-exposed medium is used as a master and again reflex exposed using the same process to obtain a positive image.
A method of claim 1 wherein said photosensitive medium absorbs less than 10 percent of the exposing, non-actinic light.
Claim 2
Dependent Claim
27 words
A method of claim 2 wherein the photoconductor comprises an inorganic compound formed between a metal and a non-metallic element of Group VIA of the periodic table.
Claim 3
Dependent Claim
14 words
A method of claim 3 wherein said photoconductor comprises a metal oxide or sulfide.
Claim 4
Dependent Claim
14 words
A method of claim 4 wherein said photoconductor comprises titanium dioxide or zinc oxide.
Claim 5
Dependent Claim
23 words
A method of claim 5 wherein said image-forming materials comprise reducible metal ions having at least the oxidizing power of the cupric ion.
Claim 6
Dependent Claim
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A method of claim 6 wherein said reducible metal ions comprise silver ions.
Claim 7
Dependent Claim
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A method of claim 7 wherein said photoconductor is dispersed in a resin binder.
Claim 8
Dependent Claim
17 words
A method of claim 8 wherein said photoconductor and resin binder are coated on a paper substrate.