Claims
- 1. An additive diffusion transfer film unit consisting essentially of a transparent support carrying, in order, an additive color screen, a silver precipitating layer comprising noble metal silver precipitating nuclei and a polymer; wherein said nuclei are present in a level of about 0.1-0.3 mgs/ft.sup.2 ; and said polymer is present at a level of from about 0.5 to 5 times the coverage of said nuclei and said layer being not more than about 2 mgs/ft.sup.2 ; wherein said silver precipitating layer is the sole layer containing silver precipitating nuclei; and a photosensitive silver halide emulsion layer.
- 2. The product of claim 1 wherein said nuclei are obtained by the reduction of a noble metal salt or complex.
- 3. The product of claim 2 wherein said reduction is effected by a first metal capable of two valences.
- 4. The product of claim 1 wherein said nuclei are present at a level of about 0.2 mgs/ft.sup.2.
- 5. The product of claim 1 wherein said polymer is gelatin.
- 6. The product of claim 1 wherein said polymer is hydroxyethyl cellulose.
- 7. The product of claim 1 wherein said polymer present at a level of about 1 times that of the nuclei.
- 8. The product of claim 5 wherein said nuclei is present at a level of about 0.2 mgs/ft.sup.2.
- 9. The product as defined in claim 1 wherein said noble metal is palladium.
- 10. The product as defined in claim 3 wherein said first metal is tin.
- 11. The product as defined in 10 wherein said noble metal salt is palladous chloride and said first metal is provided by stannous chloride.
- 12. The product of claim 1 which includes an antihalation layer.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 649,201, filed Jan. 14, 1976, now abandoned.
US Referenced Citations (3)
Continuations (1)
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Number |
Date |
Country |
Parent |
649201 |
Jan 1976 |
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