1.1 This standard provides a method for quantitatively determining the thiosulphate content of processed photographic paper prints. The method is intended for use in the selection of prints with reference to their probable permanency and in the control or evaluation of processing.
1.2 The method given in this standard is also valid and preferable as a means for determining any residual thiosulphate (and tetrathionate) in prints which have been treated with hypo-eliminators. Thus, the effectiveness of a given hypo-eliminator can be determined.
IS 6650-1972 history
2023ISO/FDIS 6650:2023 Fertilizers, soil conditioners and beneficial substances — Simultaneous determination of N-(n-Butyl) thiophosphoric triamide and dicyandiamide by high-performance liquid chromatography
1973IS 6650-1972 Method for determination of residual thiosulfate and tetrathionate in treated photographic paper