Objavljen
Cancels and replaces the first edition (1976). Establishes criteria for the purity of photographic-grade potassium bromide and specifies the test methods to be used to determine the purity.
POVUČEN
ISO 420:1976
OBJAVLJEN
ISO 420:1994
90.93
Odluka o potvrđivanju standarda
6. 6. 2026.