ISO 423:1994
Photography — Processing chemicals — Specifications for hydroquinone
Photography — Processing chemicals — Specifications for hydroquinone
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 6
- Дата публикации:
- 21 апреля 1994 г.
- Издание:
- ISO IS 423 edition 2 version 1
- ICS:
- 37.040.30
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.
Abstract
Overview
ISO 423:1994 - Photography – Processing Chemicals – Specifications for hydroquinone is an international standard developed by ISO for ensuring the quality and purity of hydroquinone used in photographic processing. As a key reducing agent in black-and-white photographic developers, hydroquinone’s purity directly influences image quality, consistency, and safety during production and processing. This standard sets forth detailed criteria for purity levels and provides methodologies for assessing various contaminants, physical characteristics, and identity of hydroquinone intended for photographic use.
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