This International Standard establishes criteria for the purity of photographic-grade potassium thiocyanate and specifies the test methods to be used to determine the purity.
BS ISO 3626:1996 history
1997BS ISO 3626:1997 Photography. Processing chemicals. Specification for potassium thiocyanate
1997BS ISO 3626:1996 Photography - Processing chemicals - Specification for potassium thiocyanate