NEN-EN 1557
Surface active agents - Colorimetric characterization of optically clear coloured liquids (products) as X,Y,Z-tristimulus values in transmission
| Organization: | NEN |
| Publication Date: | 1 November 1996 |
| Status: | active |
| Page Count: | 17 |
| ICS Code (Surface active agents): | 71.100.40 |
scope:
This standard specifies a method for the colorimetric characterization of optically clear, slightly tinted liquids (products) by broad-band measurement of pure transmittance with tristimulus value measuring filters as TX, TY and TZ. Since the tristimulus value measuring filters of simple tristimulus colorimeters meet the Luther condition to a limited extent only it is necessary to deliberately restrict the liquids (products) to slightly tinted ones in order to be able to measure them sufficiently exactly with a single calibration against uncoloured distilled water. If the colour of heavily coloured solutions is measured with simple tristimulus colorimeters, it is necessary to calibrate the instrument with a spectrometricaly measured standard of very similar colour.
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