| 摘要 |
Light-sensitive or other layers of fast emulsion, or emulsions used in tropics, contain pref. 0.05-20 m mole/mole silver halide of a bis-tetrazole compound of formula:- (where a is direct bond or divalent organic group, especially saturated or olefinically unsaturated aliphatic group, such as C1-5 alkylene or alkenylene, the groups being opt. interrupted by one or more hetero atoms).
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