Appearance measurement
The colour of the samples exposed to an appearance degradation test is measured before and after the test, using a colorimeter or spectrocolorimeter. The details vary from one test method to another.

The colour fastness results are expressed using the CIELAB colour model and delta E (the measurement of the difference between two colours).

The laboratory's measuring instruments are frequently used in industry to check the colour of the manufactured products compared with a colour standard.
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CIE Lab color system Color measurment with a spectrocolorimeter Detail of the measurement zone
Browse the Test sub-family
and access the "Online test request" page.