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ISO 423:1994

Photography — Processing chemicals — Specifications for hydroquinone

Publication date:   Apr 21, 1994

General information

90.93   Standard confirmed   Jun 6, 2026

ISO

ISO/TC 42 Photography

International Standard

37.040.30   Photographic chemicals

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 423:1976

NOW

PUBLISHED
ISO 423:1994
90.93 Standard confirmed
Jun 6, 2026