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Photography. Processing chemicals. Specifications for benzotriazole best-seller 1 Principle of measurements

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1 Principle of measurements

BS EN 1534 specifies a method

existing standards concerning environmental performance communication are evaluated with regards to their suitability

the methods of testing for verification of conformity to the requirements of BS EN 13604

Photography. Processing chemicals. Specifications for benzotriazole best-seller 1 Principle of measurements1 Scope This International Standard establishes criteria for the purity of photographic grade benzotriazole and specifies the tests to be used to determine the purity.

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