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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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

Porringer
Glass Dictionary Term

A shallow dish, usually with one or two horizontal handles, for porridge or similar food. Porridge is either a soft food made by boiling meal of cereals or legumes in milk or water until it becomes thick, or a soup of meat and vegetables, often thickened with cereal. Porringers Porringer and Plate

Porrón
Glass Dictionary Term

(Spanish) A type of drinking vessel with a narrow neck, a long and tapering spout, and no handle, used in Spain for drinking wine by pouring it into the mouth. Porróns Porron poron porrons porons Drinking Vessel (Porron)

Posset pot
Glass Dictionary Term

A spouted vessel used for consuming posset, a beverage of hot milk curdled by wine or ale, usually spiced or sweetened, and thickened with oatmeal or bread. The drinker sucked the liquid through the spout and ate the residue with a spoon. posset pots Posset Pot with Raven's Head Seal

Post
Glass Dictionary Term

The glass used to attach a second pontil to glass that is about to be pulled into a cane. posts

Post technique
Glass Dictionary Term

Instead of being applied to a vessel with a wad, the pontil is attached to a flat plate of glass called a “post,” which is then affixed to the base or footring of the vessel. post-technique

Pincers
Glass Dictionary Term

A glassworker’s tool used for decorating objects by pinching the glass while it is hot. pincer

Plaque
Glass Dictionary Term

An ornamental plate or tablet intended to be hung up as a wall decoration or inserted in a piece of furniture. plaques Archangel Uriel

Plastic
Glass Dictionary Term

Susceptible to being modeled or shaped. When it is in a molten state, glass can be described as plastic.

Plate glass
Glass Dictionary Term

Flat glass of high quality, formed by rolling molten glass on a metal plate and later grinding and polishing it until the surfaces are parallel and completely smooth. plate glasses

Plating
Glass Dictionary Term

A 19th-century American synonym for casing. Peachblow Lamp

Pokal
Glass Dictionary Term

(German) A covered goblet with a flared bowl, made mostly in Germany between the 17th and 19th centuries, and used for drinking toasts. pokals pokel pokels Pokal with Cover

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