Cut glass in the context of "Glass cutter"

Engraved glass is a type of decorated glass that involves shallowly engraving the surface of a glass object, either by holding it against a rotating wheel, or manipulating a "diamond point" in the style of an engraving burin. It is a subgroup of glass art, which refers to all artistic glass, much of it made by "hot" techniques such as moulding and blowing melting glass, and with other "cold" techniques such as glass etching which uses acidic, caustic, or abrasive substances to achieve artistic effects, and cut glass, which is cut with an abrasive wheel, but more deeply than in engraved glass, where the engraving normally only cuts deeply enough into the surface to leave a mark. Usually the engraved surface is left "frosted" so a difference is visible, while in cut glass the cut surface is polished to restore transparency. Some pieces may combine two or more techniques.

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 metallurgy, cold forming or cold working is any metalworking process in which metal is shaped below its recrystallization temperature, usually at the ambient temperature at or near room temperature. Such processes are contrasted with hot working techniques like hot rolling, forging, welding, etc. The same or similar terms are used in glassmaking for the equivalents; for example cut glass is made by "cold work", cutting or grinding a formed object.

Cold forming techniques are usually classified into four major groups: squeezing, bending, drawing, and shearing. They generally have the advantage of being simpler to carry out than hot working techniques.

Art glass is a subset of glass art, this latter covering the whole range of art made from glass. Art glass normally refers only to pieces made since the mid-19th century, and typically to those purely made as sculpture or decorative art, with no main utilitarian function, such as serving as a drinking vessel, though of course stained glass keeps the weather out, and bowls may still be useful.

The term is most used of American glass, where the style is "the logical outcome of the American demand for novelty during the 19th century and was characterized by elaborate form and exotic finish", but not always the highest quality of execution. There was a great interest in complex colour effects and painted enamelled glass. For art historians the "art glass" phase replaced the "Brilliant Period" of High-Victorian heavy decoration, and was in turn was replaced around 1900 by Art Nouveau glass, but the term may still be used for marketing purposes to refer to contemporary products. In fact the "Brilliant Period" style, which relied on deeply cut glass, continued to be made until about 1915, and sometimes thereafter.

Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. Lead glass typically contains 18–40% (by mass) lead(II) oxide (PbO); modern lead crystal or leaded crystal, historically also known as flint glass for the original silica source, contains a minimum of 24% PbO. Lead glass is desirable for a variety of uses due to its clarity. In marketing terms it is often called crystal glass.

The term lead crystal is, technically, not an accurate way to describe lead glass, because glass lacks a crystalline structure and is instead an amorphous solid. The use of the term remains popular for historical and commercial reasons but is sometimes changed to simply crystal because of lead's reputation as a toxic substance. It is retained from the Venetian word cristallo to describe the rock crystal (quartz) imitated by Murano glassmakers. This naming convention has been maintained to the present day to describe decorative holloware.

A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors, cupboard doors and vehicle doors. There are many designs of door handle, depending on the appropriate use. A large number of handles, particularly for commercial and residential doors, incorporate latching or locking mechanisms or are manufactured to fit to standardised door locking or latching mechanisms.

The most common types of door handle are the lever handle and the doorknob. Door handles can be made out of a plethora of materials. Examples include brass, porcelain, cut glass, wood, and bronze. Door handles have been in existence for at least 5000 years, and its design has evolved since, with more advanced mechanism, types, and designs made.