ISO 423:1994
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Photography — Processing chemicals — Specifications for hydroquinone
Published By | Publication Date | Number of Pages |
ISO | 1994-05 | 12 |
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.