Frosted glass, with its characteristic opaque surface, can be obtained by two different techniques: the first, chemical in nature, exploits the corrosive properties of hydrochloric acid, while the second, mechanical in nature, uses the abrasive capacities of jets of silica sand. However, in order to make transparent glass completely or partially opaque (frosted), it is possible to use a diluted solution of hydrofluoric acid or the process of sand-blasting. Let’s see what the two techniques of frosting glass actually involve.

Transparent glass can be made translucent or opaque by a special treatment with hydrofluoric acid, whose name “etched glass” many people use to refer to frosted glass.

The technique of sand-blasting consists of creating special decorative effects on glass, which range from simply making the surface of the glass opaque to the creation of artistic etchings on one or both faces of the glass. In order to obtain frosted glass, the jet of sand, suitably calibrated, is directed over the whole sheet of glass or part of it.

There is, finally, a third technique which creates frosted glass on one or more sides or in decoration; this involves etching with carborundum micro-mills or tungsten grinders, and is a technique which requires vast experience, precision, a steady hand, patience and ability to control the instrument.