Silver halide emulsion colour photographic chemical sensitisation

摘要

Chemical sensitisation of Ag halide (AgX) emulsions with: (a) Au, and (b) S or Se cpds. in the presence of spectral sensitisers comprises adding at least 10 wt.% of the optimum amt. of dye for sensitisation and halogen-substd. tetraazaindene (I), in an amt. of 10<-6> - 10<-3> mole/mole AgX before or during addn. of the chemical sensitisers but after pptn.