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- W2493413498 abstract "Electron micrography has been used to record the etching and recrystallization effects on grains by solutions used in studies of latent-image distribution. Samples of five representative emulsions differing in silver halide composition and grain shape were each treated in solutions which would have constituted conventional, surface-image and internal-image developers if developing agents had been present. The effects of latent-image bleaches were also studied. Normal and extended times of treatment were given in many cases, with some variations in the concentration of active constituents. The main conclusions reached are as follows: (a) Significant etching of emulsion grains occurs with conventional developers, with the addition of recrystallization in the case of chloride emulsions. Etching is increased considerably on omission of bromide. (b) Surface developers have negligible efTects on emulsion grains other than in the case of silver chloride. (c) Etching and recrystallization ofsilver halides by latent-image bleaches may occur. This may lead to the undesirable removal of latent-image specks from sites within a grain. (d) Sodium thiosulphate reveals internal image by etching whereas potassium iodide achieves this by inducing recrystallization. The lalter process is to be preferred in principle, but it would appear that the extent of the reaction varies considerably through the thickness of an emulsion layer. (e) The higher reactivity of silver chloride compared with that of silver bromide and iodobromide is emphasized. This may require some care in the formulation of solutions for use with chloride emulsions and in the interpretation of results obtained by their use." @default.
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- W2493413498 date "1979-09-01" @default.
- W2493413498 modified "2023-10-14" @default.
- W2493413498 title "Etching and Recrystallization Effects of Solutions used in Studies of Latent-image Distribution" @default.
- W2493413498 doi "https://doi.org/10.1080/00223638.1979.11738029" @default.
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