| 摘要 |
The use of a red-sensitising trinuclear merocyanine dye and an osmium dopant according to formula (I) : [Os(NZ)L5]r wherein Z is sulphur or oxygen, L is a ligand and r is 0, -1, -2 or -3, in photographic silver halide emulsions for use in photographic materials, result in a reduction and/or prevention of speed gain in the emulsion over time without significant speed loss.
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