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EVS-EN ISO 6271:2015

Clear liquids - Estimation of colour by the platinum-cobalt colour scale (ISO 6271:2015)

General information
Valid from 05.01.2016
Base Documents
EN ISO 6271:2015; ISO 6271:2015
Directives or regulations
None
Standard history
Status
Date
Type
Name
05.01.2016
Main
09.02.2005
Main
09.02.2005
Main
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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