DS DS/EN ISO 6271-1
DS DSEN SO 6271-1 2004-DEC-01 Clear lquds - Estmaton of colour by the platnum-cobalt scale - Part 1 Vsual method
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This standard specifies a method for estimating the colour, in Pt-Co units, of clear liquids. It is applicable to clear liquids having colour characteristics similar to those of the reference platinum-cobalt scale.