prov:value
| - The properties of silver halide can be controlled by letting a compound such as copper, iridium, lead, bismuth, cadmium, zinc (for example, a chalcogen compound such as sulfur, selenium or tellurium), gold or a compound of noble metals belonging to Group VII, be present during the production of silver halide precipitate as described in U.S. Pat. Nos. 2,448,060, 2,628,167, 3,737,313 and 3,772,031,
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