The American annual of photography . dol, as it was found that the action of the developer onthe Amidol treated plates had been so greatly accelerated thatunless the emulsion was very fresh a considerable chemicalfog was produced even when the plate was developed in dark-ness. Dr. Lueppo-Cramers statement that the presence ofsulphite in the Amidol solution destroyed the latters peculiarproperty of desensitizing was verified. In some cases thephenosafranine has a tendency of slightly staining the gelatinea reddish color, especially if it is used as a preliminary bath. While the stain is not obj
The American annual of photography . dol, as it was found that the action of the developer onthe Amidol treated plates had been so greatly accelerated thatunless the emulsion was very fresh a considerable chemicalfog was produced even when the plate was developed in dark-ness. Dr. Lueppo-Cramers statement that the presence ofsulphite in the Amidol solution destroyed the latters peculiarproperty of desensitizing was verified. In some cases thephenosafranine has a tendency of slightly staining the gelatinea reddish color, especially if it is used as a preliminary bath. While the stain is not objectionable, it can be easily re-moved by placing the plate after fixing and washing a shorttime for a few minutes in a strong solution of alum contain-ing a small quantity of pure hydrochloric acid and washingagain. The presence of the phenosafranine in the developerdoes not cause any deterioration in either fresh or used de-veloper even after some months. In other words, it is perfectlysafe to add the dye to the stock developer. qb. PONTIFICAL HIGH MASS. JULIEN J. PROSKAUER. 99
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
