Gray Scale Determination

By means of the gray scale determination the optical surface change is identified after different loads.

These stresses can include processing, after-treatment, light aging, weathering and temperature aging. The difference in color of a specimen is compared with the gray scale sections. The tested specimen is given the number closest to the color fastness level on the gray scale.

Test specimenSample sheet
Basic dimensions 60 mm x 40 mm x d


The dimensions mentioned refer to test specimens manufactured in our laboratory. All common specimen geometries with a flat surface can be tested.

Gray scale for determining color differencesGray scale for determining color differences