Mottling
Mottling is an undesirable defect which can occur with effect coatings – it is most obvious on light metallic finishes. The total color impression shows irregular areas of lightness variations. These "patches" are usually visually evaluated, described as a mottling effect.
- Simulation of visual perception
The cloud-runner optically scans the surface and measures the lightness variations. The specimen is illuminated with a white light LED at a15° angle and the lightness is detected under three viewing angles to simulate visual evaluation under different observing conditions: 15°, 45° and 60° measured from the specular
reflection.
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