Charge-transfer complexes of cyanine dyes; their use in manufacturing direct-positive photographic materials, the direct-positive material and images obtained therewith

摘要

Charge-transfer complexes consisting of 5 molecules of a strongly basic dinuclear cyanine dye and a chloranile or bromanile molecule can be adsorbed on silver halide crystals, which can then be used in manufacturing direct-positive photographic materials.