Glass etching is a glass fabrication process in which a piece of glass, or a glass product has a design, pattern or other information marked on it. Glass etching is most often used for decorative purposes, but can also serve to be functional in some applications. All sorts of glass products are etched, including window panes, doors, beverage bottles, cookware and serving dishes, glassware and ornaments.
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Etching glass affects its opaque properties and extends the range of use for otherwise standard glass, although it is not very effective on tempered glass. By abrading or roughening the surface of a glass product, the typically smooth texture is removed and replaced by a rougher, more opaque surface and the contrast of clear glass and frosted glass makes the etched design or image stand out. Glass etching is a permanent process that cannot be reversed, and it is useful on objects such as cookware which is frequently washed, as marks made with glass etching will not fade over time as with other types of marking. The designs can be as simple as notches on a measuring cup or a sight glass, or as intricate as a delicate pattern on a glass ornament. The complexity of the glass etching is dependent upon both the skill of the glass fabricator and the tools and process used.
There are three main methods of glass etching: chemical etching, the use of engraving pens and tools or the most commonly used method of abrasive etching. Chemical or acid etching is a fairly straightforward process, and the one most often used by amateurs and hobbyists. A chemical cream or etching liquid is used and applied to the surface of the glass either using a stencil or by free hand design. The acid corrodes a thin layer of the glass creating a frosted appearance. Depending on the desired depth of the etched design, the cream can be left on for a longer time, or reapplied to etch the surface further. Engraving tools, such as those used to etch designs on metal surfaces, can also be used to etch, or engrave glass although this requires a higher level of skill and is a time consuming process, making it unsuitable for mass produced glass products. The most common method of abrasive blasting however is used widely in industrial applications. A stream of high pressure air is directed at the glass product and is combined with a fine abrasive material such as sand. A layer on the surface of the glass is removed by the abrasion creating a frosted appearance. The longer the stream of air is targeted at one spot, the deeper the etching will be.
