Clear liquids. Estimation of colour by the platinum-cobalt scale - Spectrophotometric method

Clear liquids. Estimation of colour by the platinum-cobalt scale - Spectrophotometric method

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1   Scope

This part of ISO 6271 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.
The method described provides a more precise way of measuring Pt-Co colour than that described in ISO 6271-1.

NOTE The term “platinum-cobalt colour (Pt-Co colour)” used here is preferred over the terms “Hazen colour” and “APHA colour”.