Measuring the gloss level of high-gloss, metallic samples is not easy due to multiple refractions on the sample surface. In the following, an interlaboratory test for gloss and colour measurement was carried out on chrome-plated trim parts from a luxury class automobile. Three manufacturers of colour and gloss measuring instruments took part. The results of the three manufacturers differ significantly in the gloss level G of the highly polished samples. The results of the individual measuring methods used differ from each other by up to 300 %.
When specifying the brightness of the samples, two manufacturers provide comparable results; when specifying the colour, no uniform pattern emerges. Colour and gloss measurements with different instruments and the same or different measuring geometry cannot be reproduced and can only be repeated to a limited extent.
Comparisons of measured values can only be made when using the identical measuring device and at the identical measuring point. For a qualitatively meaningful
For a qualitatively meaningful check of the colour and gloss values, a colour sample or master sample should always be available. This can be visually compared with the sample in a colour sample booth under standardised light. In colour management, it is the visual impression that counts. Instrumental colour and gloss measurements support developers to be able to adjust colours specifically. To achieve a satisfactory result for the customer, the following points must be agreed in advance: 1. measurement geometry, 2. measurement point, 3. master sample, 4. visual assessment.

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