IS 6650 : 1972 Method for determination of residual thiosulphate and tetrathionate in processed photographic papers

1 Scope

1.1 This standard provides a method for quantitativelydetermining the thiosulphate content of processed photographicpaper prints. The method is intended for use in the selection ofprints with reference to their probable permanency and in thecontrol or evaluation of processing.

1.2 The method given in this standard is also valid andpreferable as a means for determining any residual thiosulphate(and tetrathionate) in prints which have been treated withhypo-eliminators. Thus, the effectiveness of a givenhypo-eliminator can be determined.

2 Reference

IS 2 : 1960 Rules forrounding off numerical values