Overview & background
Opal glass — also called milk glass — is glass opacified to a solid, even white with a soft, porcelain-like surface. In cosmetics it signals clean, clinical luxury, and because it is fully opaque it blocks all light, protecting light-sensitive formulas as well as or better than amber while looking far more premium.
The white body is also the perfect background for restrained, high-contrast decoration, which is why minimalist prestige and dermo-cosmetic brands favour it.
