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I3A IT4.156-2002
- Photography (Chemicals) - Sodium Formaldehyde Bisulfite, Anhydrous (revision and redesignation of ANSI/NAPM IT4.156-1986 (R1995))
- standard by International Imaging Industry Association, 09/05/2002
- Publisher: I3A
$16.00$31.00
Establishes criteria for the purity of photographic-grade anhydrous sodium formaldehyde bisulfite and describes the tests to be used to determine the purity.
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