Reference number
ISO 423:1994
© ISO 2024
International Standard
ISO 423:1994
Photography — Processing chemicals — Specifications for hydroquinone
Edition 2
1994-05
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Published (Edition 2, 1994)
This publication was last reviewed and confirmed in 2021. Therefore this version remains current.

ISO 423:1994

Language
Format
CHF 42
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Abstract

Establishes criteria for the purity and describes the test methods for identity tests, residue after ignition, heavy metals content, iron content, appearance of solution. Annex A describes preparation of the standard ammonium cerium(IV) hexanitrate solution.

General information

  • Status
     : Published
    Publication date
     : 1994-05
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 2
    Number of pages
     : 6
  • Technical Committee :
    ISO/TC 42
    ICS :
    37.040.30 
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