ISO 423:1994

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Photography -- Processing chemicals -- Specifications for hydroquinone

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ISO 423:1994

Photography -- Processing chemicals -- Specifications for hydroquinone

PUBLISH DATE 1994
ISO 423:1994

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.

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