Blanching

A whitish or hazy appearance that forms in a paint or varnish layer as a result of microscopic defects—such as voids, granules, or fine fissures—that develop over time. These micro-irregularities scatter incident light, causing the affected area to appear lighter or more opaque than the surrounding surfaces. Blanching is often associated with ageing, environmental fluctuations, or localized changes in the optical properties of the coating.