M00017075
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ISO DIS 6271 2014 Edition, February 28, 2014 CLEAR LIQUIDS - ESTIMATION OF COLOUR BY THE PLATINUM-COBALT COLOUR SCALE
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Availability date: 07/14/2021
Description / Abstract:
ISO 6271 specifies a spectrophotometric method for estimating
the colour of clear liquids in terms of 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 intensively than the Pt-Co stock
solution the ISO 4630 method is recommended.
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".