ISO 6271:2015Published

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

Liquides clairs — Évaluation de la couleur au moyen de l'échelle platine-cobalt

Abstract / 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

Replaces

ISO 6271-1:2004WithdrawnClear liquids — Estimation of colour by the platinum-cobalt scale — Part 1: Visual methodInternational Standard · Published 23 Nov 2004 · ISO/TC 35 ISO 6271-2:2004WithdrawnClear liquids — Estimation of colour by the platinum-cobalt scale — Part 2: Spectrophotometric methodInternational Standard · Published 23 Nov 2004 · ISO/TC 35