SS-EN-ISO-6271 › Clear liquids - Estimation of colour by the platinum-cobalt colour scale (ISO 6271:2015)
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This International Standard specifies a spectrophotometric method for estimating the colour of clear liquids in terms of platinum-cobalt units (Pt-Co units). It is applicable to clear liquids having a colour characteristic similar to those of the platinum-cobalt colour scale specified in Annex A. For products with colours more intense than the Pt-Co stock solution the method specified in ISO 4630 applies.The spectrophotometric method provides a more precise way of measuring Pt-Co colour than a visual sample comparison by human eyes.NOTE The term Pt-Co colour used here is preferred over the terms Hazen colour and APHA colour.
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SS-EN ISO 6271:2016
Jan. 12, 2016
EN ISO 6271:2015(IDT); ISO 6271:2015(IDT)