JPS54161927A - Silver halide emulsion for direct positive photography - Google Patents
Silver halide emulsion for direct positive photographyInfo
- Publication number
- JPS54161927A JPS54161927A JP7104878A JP7104878A JPS54161927A JP S54161927 A JPS54161927 A JP S54161927A JP 7104878 A JP7104878 A JP 7104878A JP 7104878 A JP7104878 A JP 7104878A JP S54161927 A JPS54161927 A JP S54161927A
- Authority
- JP
- Japan
- Prior art keywords
- silver
- kept
- mole
- concentration
- halide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE: To enhance sensitivity and contrast, to reduce minimum density, and to prevent secondary reversal, by forming the central parts of silvar halide grains causing fog, under the conditions of high silver concentration and below 4 in pH.
CONSTITUTION: Aqueous solutions of water-soluble silver salt and water-soluble alkali halide are each added to an aqueous solution of protective colloid, such as gelatin, and mixed in this. The silver concentration of the mixture is kept within 10-1 and 10-6, preferably within about 10-2 and 10-4 mole/liter, and the pH value of the mixture is kept within 4 and about 1 till addition of 1/20 of the total silver amount is finished. After that, the concentration of Ag+ is kept below 10-6 mole/ liter, and the pH value is kept below 7.5 to form silver halide. Silver iodobromide prepared, preferably containing silver iodide below 10 mole% is washed and then, fogged. This processing permits positive images of improved dot quality to be formed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7104878A JPS6054664B2 (en) | 1978-06-12 | 1978-06-12 | Silver halide emulsion for direct positive photography |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7104878A JPS6054664B2 (en) | 1978-06-12 | 1978-06-12 | Silver halide emulsion for direct positive photography |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54161927A true JPS54161927A (en) | 1979-12-22 |
JPS6054664B2 JPS6054664B2 (en) | 1985-11-30 |
Family
ID=13449239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7104878A Expired JPS6054664B2 (en) | 1978-06-12 | 1978-06-12 | Silver halide emulsion for direct positive photography |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6054664B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6280767U (en) * | 1985-11-12 | 1987-05-23 |
-
1978
- 1978-06-12 JP JP7104878A patent/JPS6054664B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS6054664B2 (en) | 1985-11-30 |
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