4. Insulating glass pathologies

4.1 Brewster's colorful bangs

Brewster bangs are colored bangs resulting from the decomposition of light into rainbows. When surfaces are of very good quality, i.e. very flat and of uniform thickness, the different components of reflected white light, colored according to wavelength, interfere and, under natural light, produce a set of colored bangs that can be observed both by transparency and reflection.

Variations in air pressure inside the double-glazing unit cause the glass to take on a convex or concave shape, resulting in an imbalance of parallelism. By exerting slight pressure on one of the...