ANSI PH4.250-1980
Photographic Grade Sodium Thiosulfate, Anhydrous (Na2S2O3) and Sodium Thiosulfate, Crystalline (Na2S2O3. 5H2O)

Standard No.

ANSI PH4.250-1980

Release Date

1980

Published By

American National Standards Institute （ANSI)

Latest

ANSI PH4.250-1980

Scope

Establishes criteria for the purity of photographic-grade sodium thiosulfite anhydrous and crystalline, and describes the tests to be used to determine the purity.

ANSI PH4.250-1980 history

• 1980 ANSI PH4.250-1980 Photographic Grade Sodium Thiosulfate, Anhydrous (Na2S2O3) and Sodium Thiosulfate, Crystalline (Na2S2O3. 5H2O)