ISO 6271:2015

ISO 6271:2015

December 2015
International standard Current

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

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".

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International ISO standards

Publication date

December 2015

Number of pages

6 p.

Reference

ISO 6271:2015

ICS Codes

87.060.20   Binders

Print number

1
Sumary
Clear liquids - Estimation of colour by the platinum-cobalt colour scale



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".

Replaced standards (2)
ISO 6271-1:2004
November 2004
International standard Cancelled
Clear liquids - Estimation of colour by the platinum-cobalt scale - Part 1 : visual method

<p>ISO 6271-1:2004 specifies a method for estimating the colour, in Pt-Co units, of clear liquids.</p> <p>It is applicable to clear liquids having colour characteristics similar to those of the reference platinum-cobalt scale.</p>

ISO 6271-2:2004
November 2004
International standard Cancelled
Clear liquids - Estimation of colour by the platinum-cobalt scale - Part 2 : spectrophotometric method

<p>ISO 6271-2:2004 specifies a spectrophotometric method for estimating the colour, in Pt-Co units, of clear liquids. It is applicable to clear liquids having a colour characteristic similar to those of the reference platinum-cobalt scale specified in ISO 6271-1, which describes a visual method.</p> <p>The method described provides a more precise way of measuring Pt-Co colour than that described in ISO 6271-1.</p>

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