All About Glass

All About Glass

This is your resource for exploring various topics in glass: delve deeper with this collection of articles, multimedia, and virtual books all about glass. Content is frequently added to the area, so check back for new items. If you have a topic you'd like to see covered, send us your suggestion. If you have a specific question, Ask a Glass Question at our Rakow Research Library.

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Dragon-stem goblet
Glass Dictionary Term

A type of goblet with the stem in the form of a dragon with a convoluted body, outspread wings, open jaws, and a crest. Known in Italian as vetri a serpenti (serpent glasses), dragon-stem goblets were first made in Venice in the 17th century. They were imitated in the Netherlands by producers of

Drawing
Glass Dictionary Term

The process of pulling semimolten glass to elongate it. It is used, for example, in the production of canes. pullings pulling

Drawn stem
Glass Dictionary Term

The stem of a drinking or serving vessel that is drawn out from the main gather rather than formed from a separate gather and then applied. Drawn stems Jacobite Portrait Wineglass

Dresser set
Glass Dictionary Term

A set of matching perfume bottles, powder jars, and similar containers, kept on a woman’s dresser. Dresser sets 5-piece Dressing Set in "Gracia" Pattern

Diatreta
Glass Dictionary Term

A term used by Frederick Carder (1863-1963) to describe openwork objects that he made by lost wax casting. Diatreta Vase

Diatretum
Glass Dictionary Term

vas diatretum (Latin, “openwork vessel”) A term frequently used to refer to a cage cup. The plural form is vasa diatreta. Cage Cup

Dichroic glass
Glass Dictionary Term

Glass that is one color when seen by reflected light and another color when light shines through it. This is sometimes due to the presence of minute quantities of colloidal gold. Today, some glassmakers achieve a similar effect by applying a dichroic coating to glass that otherwise would not have

Die sinker
Glass Dictionary Term

A maker of metal molds. Die sinkers

Dip mold
Glass Dictionary Term

A cylindrical or truncated conical one-piece mold with a patterned interior. The mold is open at the top so that a parison can be dipped into it and then inflated. It is also known as an optic mold. Dip molds optic-mold optic molds Optic mold

Custard glass
Glass Dictionary Term

A vessel for an individual serving of custard, a sweetened mixture of milk and eggs, which can be baked, boiled, or frozen. Custard glasses

Cutting
Glass Dictionary Term

The technique whereby glass is removed from the surface of an object by grinding it with rotating wheels made of stone, wood, and cork. The first stage of the process employs a stone wheel under a continuous stream of water. Later, wheels of fine-grained stone and wood, fed with various abrasives,

Cylinder glass
Glass Dictionary Term

Window glass made by inflating a large gather and swinging it until it forms a cylinder. The cylinder is then detached from the blowpipe, and both ends are removed with shears. Next, the cylinder (sometimes known as a muff) is cut lengthwise, reheated, and either tooled or allowed to slump until it

Daumenglas
Glass Dictionary Term

(German, “thumb glass”) A large cylindrical or barrel-shaped forest glass beaker with circular indentations for the user’s fingers and thumbs. Daumengläser were made in Germany and the Netherlands in the 16th and 17th centuries. Drinking Barrel (Daumenglas)

Decanter
Glass Dictionary Term

A decorative bottle with a stopper, used for serving wines and spirits. decanters Decanter and Stopper in "Russian" Pattern

Decolorizer
Glass Dictionary Term

A substance (such as manganese dioxide or cerium oxide) used to remove or offset the greenish or brownish color in glass that results from (1) iron impurities in the batch or (2) iron or other impurities in the pot or elsewhere in the production process.

Depression glass
Glass Dictionary Term

Inexpensive, machine-pressed American glassware made between about 1920 and 1950.

Devitrification
Glass Dictionary Term

(1) The process whereby glass becomes partly crystallized as it cools (usually too slowly) from the molten state; (2) the crystals formed by this process. Devitrification can also occur on the surface as a result of unsuccessful annealing or accidental heating to a high temperature. It is not

Diamond air trap
Glass Dictionary Term

Decoration consisting of bubbles of air trapped in the glass in a diamond-shaped pattern. This is achieved by blowing a gather of glass into a mold with projections of the desired design, withdrawing it, and covering it with a second gather, which traps pockets of air in the indentations. This

Diamond-point engraving
Glass Dictionary Term

The technique of decorating glass by scratching the surface with a diamond. Diamond-tipped tools may have been used by the ancient Romans and in the medieval Islamic world, but they were popularized by the Venetians in the 16th century. Diamond-point engraving was carried to some of its greatest

Cruet
Glass Dictionary Term

A small, ewerlike vessel, usually with a lip or spout, a handle, and a stopper, for serving condiments at the table. cruets Cruet with Stopper in "112" Pattern

Crystal
Glass Dictionary Term

A popular term for colorless lead glass, which has a high refractive index and consequently is particularly brilliant. In the United Kingdom, glass described as crystal must contain a defined percentage of lead oxide. Today, the word is often used to describe any fine glass tableware. Cordial Glass

Cullet
Glass Dictionary Term

(1) Raw glass or pieces of broken glass from a cooled melt, intended for use as an ingredient of batch; (2) scrap glass intended for recycling.

Cup plate
Glass Dictionary Term

A small plate on which users set their tea or coffee cup while drinking from the saucer. Between about 1825 and about 1865, it was fashionable to drink from saucers, and cups were placed on cup plates to avoid staining the tablecloth. Cup plates Cup Plate

Cupping glass
Glass Dictionary Term

A small cup in which a partial vacuum is created for cupping. Cupping is the technique of drawing blood to the surface of the body, usually for bloodletting. cupping glasses bleeding glasses Bleeding glass Cupping Glass

Crimper
Glass Dictionary Term

A tool used for decorating objects by giving them a crimped or wavy edge.

Cristallo
Glass Dictionary Term

(Italian, “crystal”) A term first used in Venice in the 14th century to describe glass that resembles colorless rock crystal. Most Venetian cristallo, however, has a gray or brownish tint. Goblet

Crizzling
Glass Dictionary Term

(or: crisseling)The result of chemical instability in glass caused by an imbalance in the ingredients of the batch, particularly an excess of alkali or a deficiency of stabilizer (usually lime). The instability of the glass results in an attack by atmospheric moisture, which produces a network of

Crown glass
Glass Dictionary Term

Sheet glass made by blowing a parison, cutting it open, and rotating it rapidly, with repeated reheating, until the centrifugal force has caused it to become a flat disk. After annealing, the disk is cut into panes of the required shape and size. Bull’s-eye panes come from the centers of the disks

Crown weight
Glass Dictionary Term

A hollow paperweight that incorporates thin white or colored filigree canes arranged vertically on the sides and drawn together at the top. crown weights

Core
Glass Dictionary Term

The form to which molten glass is applied in order to make a core-formed vessel. In pre-Roman times, the core is thought to have been made of animal dung mixed with clay.

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