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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Rock-crystal engraving
Glass Dictionary Term

A style of copper-wheel engraving that, combined with polishing, gave glass objects the appearance of rock crystal. The style was introduced by Thomas Webb & Sons of England in the 1870s. rock-crystal engravings rock-crystal-engraving Ewer

Rod
Glass Dictionary Term

A monochrome segment of glass cut from a trail. rods

Rod forming
Glass Dictionary Term

The technique of winding molten glass around the tip of a narrow metal tool or wire coated with clay or kiln wash to act as a separating agent. It is used for making narrow objects such as beads and pendants. rod-forming rod formings

Rolling pin
Glass Dictionary Term

A cylindrical object, usually made of wood but sometimes of glass, for rolling out dough or pasta to the required thickness. Many glass rolling pins are friggers, with a knob at each end so that they can be suspended by a cord. rolling pins rolling-pin

Roman foot
Glass Dictionary Term

A flangelike base formed by folding. The ancient Romans were the first glassworkers to make bases in this manner. roman feet

Relief cutting
Glass Dictionary Term

A type of cut glass with decoration in high relief, made by removing the background. Relief cuttings Relief-cut Relief-cuts Relief-cutting Releif cutting Hochschnitt Goblet

Resist
Glass Dictionary Term

A substance that resists or prevents a particular action. During the process of acid etching or sandblasting, parts of the surface are protected with a resist. Resists

Retort
Glass Dictionary Term

A vessel with a long neck, bent downward, in which liquids subjected to distillation are heated. retorts Retort

Reverse foil engraving
Glass Dictionary Term

A decorative technique in which gold or silver leaf is applied to the back side of a piece of glass, engraved, and protected by varnish, metal foil, or another piece of glass. reverse foil engraved reverse foil engraving reverse-foil engraving reverse-foil engraved Verre églomisé Brant Mansion, St.

Reverse painting
Glass Dictionary Term

The term applied to a number of decorative techniques, all of which involve painting, on the back side of the glass, a design that is viewed from the front (that is, through the glass). Because of this, the painter must apply the pigments in the reverse of the normal order, beginning with the

Raspberry prunt
Glass Dictionary Term

A flat, circular prunt with an impressed design resembling a raspberry. raspberry prunts raspberry prunted rasberry prunt rasberry prunts razzberry prunt razzberry prunts raspberry-prunt raspberry-prunted Roemer

Reactive glass
Glass Dictionary Term

A type of glass, made by Louis Comfort Tiffany (1848-1933), that changed color when it was reheated. reactive glasses reactive-glass reactive-glasses

Reducing atmosphere
Glass Dictionary Term

An atmosphere in a kiln or furnace that is deficient in oxygen. Sometimes, a reducing atmosphere is created deliberately to reduce oxides to their metallic state, as in the case of luster pigments. Reducing atmospheres Reducing-atmosphere

Refractory
Glass Dictionary Term

A substance, usually clay with a high silica content, capable of resisting high temperatures. Furnaces and pots are made from refractory materials. Refractories

Reichsadler Humpen
Glass Dictionary Term

(German, “imperial eagle beaker”) A Humpen decorated with Reichsadler, a heraldic two-headed eagle whose wings bear the insignia of the Holy Roman Empire. Reichsadler Humpens Riechsadler Humpen Riechsadler Humpens Reichsadler Humpen

Prince Rupert’s drop
Glass Dictionary Term

A solid, hollow glass object, about two inches long, with a bulbous end and a narrow, curving “tail.” It is made by dropping a blob of hot glass into cold water and leaving it there until it has cooled. The rounded end resists a blow, but because of internal stress due to the absence of annealing,

Printy
Glass Dictionary Term

A circular or oval wheel-cut depression. Prismatic cutting (2) A decorative pattern of long, mitered grooves, cut horizontally in straight lines so that the top edges of each groove touch the edges of the adjoining grooves. Prismatic cutting is usually found on the necks of pitchers and decanters.

Prunt
Glass Dictionary Term

A blob of glass applied to a glass object primarily as decoration, but also to afford a firm grip in the absence of a handle. prunts prunted Beaker with Prunts

Pulegoso
Glass Dictionary Term

(Italian, from the dialect word pulega, “bubble”) Glass containing numerous bubbles of all sizes, produced by adding bicarbonate of soda, gasoline, or other substances to the melt. The bubbles make the glass semiopaque and give the surface an irregular texture. Pulegoso was developed by Napoleone

Punch bowl
Glass Dictionary Term

A bowl for mixing and serving punch. Traditionally, punch was composed of wines or liquors, mixed with hot water or milk, and flavored with sugar, lemons, or spices. Fruit punches, with or without alcohol, are also common. punch bowls punchbowl punchbowls Punch Bowl with Ladle and 10 Cups

Pyrex
Glass Dictionary Term

A type of borosilicate glass perfected in 1915 by W. C. Taylor and Eugene Sullivan of Corning Glass Works in Corning, New York. Pyrex rods can be used in flameworking. pirex pyrexes pirexes Engraved Pyrex Casserole with Lid and Holder

Pyxis
Glass Dictionary Term

(from Greek and Latin), pl. pyxides. A covered box for the toilet table, used to contain cosmetics, medicines, and jewelry. pyxides pyxide pyxises Pyxis with Lid

Quarry
Glass Dictionary Term

A small square- or diamond-shaped pane. quarries quary quaries

Quincunx
Glass Dictionary Term

(from Latin, “five-twelfths”) An arrangement of five objects in a square or rectangle, with one at each corner and one in the middle, like the five spots on dice. Prunts and other motifs are sometimes arranged in a quincunx pattern. Quincunxes Quincunks Quincunxi

Raised diamond cutting
Glass Dictionary Term

An allover pattern of raised four-sided diamonds of pyramidal form, each with a sharp apex, cut with a mitered wheel. It was produced by English and Irish glass cutters between about 1780 and 1825. raised-diamond cutting raised-diamond-cut raised-diamond cut raised diamond cut Luster Vase in "

Pot
Glass Dictionary Term

A fire-clay container in which batch is fused and kept molten. The glassworker gathers glass directly from the pot. pots

Potash
Glass Dictionary Term

Potassium carbonate. It is an alternative to soda as a source of alkali in the manufacture of glass.

Potash-lime glass
Glass Dictionary Term

A form of glass containing three major compounds in varying proportions: silica (usually about 60-75 percent), potash (12-18 percent), and lime (5-12 percent). Forest glass is a common type of potassium-lime glass. Potash glass is slightly denser than soda-lime glass; it passes from the molten to

Preserving jar
Glass Dictionary Term

A jar for preserving food. The term refers to jars with a variety of methods for sealing the contents. John Landis Mason perfected the first inexpensive method of sealing glass jars in 1858. preserving jars Preserving Jar

Pressed glass
Glass Dictionary Term

Glassware formed by placing a blob of molten glass in a metal mold and pressing it with a metal plunger or “follower” to form the inside shape. The resultant piece, termed “mold-pressed,” has an interior form independent of the exterior, in contrast to mold-blown glass, whose interior corresponds

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