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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'.
| Author | ISO/TC 35 Paints and varnishes |
|---|---|
| Editor | ISO |
| Document type | Standard |
| Format | Paper |
| Edition | 3 |
| ICS | 87.060.20 : Binders
|
| Number of pages | 6 |
| Replace | ISO 6271-1:2004 ISO 6271-2:2004 |
| Weight(kg.) | 0.1102 |
| Year | 2015 |
| Country | Switzerland |