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ISO 6271:2015

Clear liquids — Estimation of colour by the platinum-cobalt colour scale

Nov 30, 2015

General information

90.20     Apr 15, 2026

ISO

ISO/TC 35

International Standard

87.060.20  

English   French  

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Scope

ISO 6271:2015 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".

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 6271-1:2004

WITHDRAWN
ISO 6271-2:2004

NOW

PUBLISHED
ISO 6271:2015
90.20 Standard under periodical review
Apr 15, 2026

National adoptions

SRPS EN ISO 6271:2016  
ISS

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

60.60   Standard published

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