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Engraved glass

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There are several different techniques of glass engraving. It has been practised since ancient times, including Roman glass, and professionally engraved glass has always been an expensive luxury, requiring lavish amounts of labour by a highly skilled craftsman or artist. In recent centuries the most notable periods and places of production started in the 16th century, initially mostly in Venetian glass, then later in Germany and Bohemian glass. From about 1645 it was used in the Netherlands, which was producing the finest engraving by 1700, by which time some engraving was used in most glass-making centres in Europe. The late 17th and early 18th centuries were in some ways the peak period of achievement and popularity. From 1730 onwards it received some competition from the new geometric cut glass style developed in England. These related techniques were often combined in a single piece, but the engraving tended to be relegated to less prominent positions.

In the 19th century cut glass continued to dominate, and new techniques of etched glass, cheaper than engraving, also took some of the role formerly occupied by engraving. By the later part of the century, a whole variety of techniques, many including coloured glass, had developed. Engraved glass retained some niches, and was sometimes used in art glass and later studio glass, but no longer had its former importance, although there has been a revival in Britain, with many public commissions for large window-size pieces.

Much glass remains in private collections, and many museums do not display much of their holdings, and often do not display them to the best advantage, which is usually against a dark background. Wineglasses were meant to be appreciated by holding in the hand, and when full any distracting engraving on the other side of the glass was not visible, or much less so.

Techniques

Glass engraving has a variety of techniques. It is an intaglio form, with images and inscriptions cut into the surface of the glass through abrasion; but if the cutting is other than very shallow, it becomes glass cutting in the usual terminology. Tools for wheel-engraving glass are typically small abrasive wheels and drills (very similar to those for cut glass), with small lathes often used. Engraving wheels are traditionally made of copper, with a linseed oil and fine emery powder mixture used as an abrasive. Today stone wheels are often used. However, any sharp point that is hard enough to mark glass may be used, and in the past "diamond-point" engraving has often been used, especially for inscriptions of text. Today this is often called "point engraving", and the tip of the tool is more likely to be tungsten carbide than diamond. Such engraving might be added to a glass (or window) at any point after the glass was made, and consequently can be hard to date.

Another form of engraving is "stipple" in which the image is created by a large number of small dots or short lines on the surface of the glass with the use of small diamond-tipped tools. The scratches and small dots made in this method can, in the hands of a skilled artist, be used to produce images of astonishing clarity and detail. A mixture of diamond-point, wheel-engraving and stipple can all be used in the same piece, though most pieces use one of them for most or all of the work. Typically the design, or at least the main outlines, are marked on the glass before engraving begins.

Sandblasting is another technique used in glass engraving. Abrasive is sprayed through a sandblasting gun onto glass which is masked up by a piece of stencil in order to produce inscriptions or images. This is often used for engraving large areas such as windows, and the result is often similar to that achieved by glass etching using acid.

The engraver might be employed by the glassmaker, or completely independent, buying glass blanks or finished glasses and other pieces to work on. This seems to go as far back as Roman times. Modern laser engraving on glass is another technique, generally only used for decorative purposes mechanically, for example to reproduce images on mirrors.

Details showing the different techniques

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