This procedure contrasts with the old metal etching techniques where the surface was covered with wax or resin, a design scratched into it and the material immersed into acid. Examples of etched glass products are monogrammed glassware, key chains, lettered windows, designed mirrors and numbers or letters applied as identification marks.
Most glass etching today is by the sandblasting method.
Two other methods, acid cream and engraving will also be discussed. In the sandblasting method, a special type of sand is held in a funnel-like holder where a blast of air is forced through it creates a miniature sandstorm. It works something like a bingo machine. The area to be etched is covered with a stencil made of a material like masking tape in which the design has been cut out. When the sand if blown against the piece, the masking tape protects areas that are to stay smooth and allows the sand to pit the glass through the stencil openings.