Agate Ware

Earthenware made to look like agate by building up irregular layers of clays coloured white, brown, green and blue.

Argyle

A vessel for keeping gravy warm similar in shape to a coffee pot. It has an inner compartment into which water is poured.

John Astbury

Born 1688 died 1743 - Shelton, Stoke-on-Trent Staffordshire.
He was a pioneer of English potting technology and earliest of the great Staffordshire potters.

Backstone

The flat round iron plate on which the transfer printer keeps the colour warm on the stove.

Bagwall

The wall on the inside of a fuel burning kiln which deflects the flame from the wear.

Banding Wheel

A revolving wheelhead which sits on a pedestal base. It is turned by hand and used for finishing or decorating pottery

Bat

A flat disc made out of plaster, wood, or plastic which is affixed to the wheel head with clay or pins. Bats are used to throw pieces on that would be difficult to lift off the wheel head.

Batch

A mixture of weighed materials such as a batch of glaze or slip or a clay body.

Belleek Ware

Ware produced in the Belleek factory in Co. Fermanagh. Characteristic was the decorative use of marine motifs.

Biscuit

Once fired clayware that hard but also porous because no glaze has been applied.

Bisque

Pottery which has been fired once, without glaze, to a temperature just before vitrification.

Bisque Fire

First firing, without glaze. Slips can be used in a bisque firing.

Black Astbury

Design is white in the centre and black around the rim. There is a gold band separating the colours with some additional fine gold designs on the black. Supplied by Wedgwood, to special order.
Plate 27 cm £590.00, Teacup £345.00, Tea saucer £250.00, Covered vegetable dish £2800.00

Blunger

Container in which slip is mixed.

Body

Name used to describe the composite materials used for the production of any type of ceramic ware.

Bone China

Hard-paste porcelain plus bone-ash (Calcium Phosphate), vitreous ceramic body that is renowned for its strength, whiteness and translucency. The composition of bone china typically contains 45 - 50% cattle bone. Developed by Josiah Spode in the 1790's.

Bone Dry

Completely air dried.

Bottle Oven

The old coal-fired kiln protected with a bottle shaped building that increased the draught and enabled the fireman to more adequately control the firing process.

British Royal Arms

The British Royal Arms was used in the marks of some manufacturers including foreign companies and is useful in dating transfer ware. The pre-1837 mark has a inescutcheon or extra shield in the centre of the larger shield.

Burnishing

The ancient rubbing process of burnishing polishes the outside skin of a clay pot while greatly reducing its porosity. This finishing is done by hand, using a stone or a metal piece which is usually embedded in a wad of wet clay that perfectly fits the burnisher's hand.

Cabaret Service

Collection of porcelain vessels comprising a small breakfast or tea service that often includes a matching wooden tray.

Cadogan Teapot

A type of lidless teapot.

Calipers

A tool used to measure the diameter of round forms, for example calipers are used to get lids to fit just right.

Centering

Technique to move the clay in to a symmetrical rotating axis in the middle of a wheel head so it can be thrown.

Ceramic

Should properly be pronounced 'keramic' From the Greek word keramos, originally the art of making pottery, now a general term for the science of manufacturing articles prepared from pliable, earthy materials that are made rigid by high-temperature treatment.

China

Hard-paste porcelain plus bone-ash (Calcium Phosphate).

China ware

Term used to describe the true porcelain wares exported from China. Today these wares are known as Chinese Export Porcelain.

Chinoiserie

Generic term used to describe wares using patterns with Chinese ornamental motifs, particularly those created by European artisans with little or no knowledge of Oriental art.

Chuck

A piece used to aid the potter in trimming. A chuck is a form that can hold a pot upside-down above the wheel head while the potter trims it. Chucks are thrown and bisque fired clay cylinders which are open on both sides.

Clarice Cliff

(1899 - 1972) Designer of the shapes and decorations applied to mass-produced Art Deco style earthenware.

Clay body

A mixture of different types of clays and minerals for a specific ceramic purpose. For example, Porcelain is a translucent white clay body.

Clobbered Ware

A design produced in underglaze blue (often Chinese) to which enamel painting has been added. Designs printed with outlines for intentional painting in with either over or under glaze enamel are not considered clobbered ware.

Coalport

Shropshire factory, founded by John Rose.

Coil

A piece of clay rolled like a rope, used in making pottery.

Compress

Pushing the clay down and together, forcing the particles of clay closer.

Composite Pots

Pots that were thrown or hand built in separate pieces and then assembled.

Cone

Cones are specially formulated ceramics formed into triangular, shapes. When placed in a kiln they will soften and bend (or "mature") at a specific temperature when the temperature is increased at a specific rate. If fired faster or slower, the cones will mature at a different temperature and therefore show the 'work' done in contrast to the temperature reached. Cones thus account for the firing history as well as the temperature.

Crawling

A bare spot (from the shrinking of a glaze) on a finished piece where oil or grease prevents the glaze from adhering to pottery.

Crazing

Minute cracks in the glaze that occur upon cooling because the rate of shrinkage of the glaze is different from the rate of shrinkage of the body.  It is the result of the glaze shrinking more than the clay body in cooling process.

These cracks can allow moisture and dirt to penetrate the glaze and discolour the ware.

Creamware

Cream coloured earthenware introduced about 1740 that was greatly improved and made famous by Josiah Wedgwood's "Queensware".

Cross hatching

An engraving technique where thin parallel lines where used to fill areas of a transfer ware pattern. The width and spacing of the lines was used to adjust the tone of the resulting colour.

Damper

A slab of refractory clay that is used to close or partially close the flue of a kiln.

Delft ware

Tin-glazed. A porous bodied earthenware with a lead glaze made opaque by the addition of tin oxide.

Derby

Factory established (1755) by William Duesbury. Periods :Chelsea Derby (1770 - 1784) Crown Derby (1786 - 1811) Bloor Derby (1811 - 1848).

Doulton

Royal Doulton.

Dry-Foot

To keep the foot or bottom of a pot free from glaze by waxing or removing the glaze.

Earthenware

Course and opaque ceramic ware which is fired at a relatively low temperature. Made from clays and silica compounds that when fired is porous and opaque. It is usually glazed to render it impervious to liquids.

Elers Ware

Unglazed smooth-surfaced red stoneware attributed to David and John Elers.

Elton Ware

'Art Pottery' produced by Sir Edmund Elton (1846 - 1920).

Englobe

Coloured clay slip used to decorate Greenwear or leather hard pieces before bisque firing. Clay and oxide and water.

Fettle

Process where small flaws and imperfections are corrected.

Fire

To heat a clay object in a kiln to a specific temperature.

Firebrick

An insulation brick used to hold the heat in the kiln and withstand high temperatures.

Firing Range

The range of temperature at which a clay becomes mature or a glaze melts.

FlatWare

Table wares that are more or less flat, e.g., plates, saucers, and platters.

Flux

A melting agent causing silica to change into a glaze.

Foot

Base of a ceramic form.

Frit

A glaze material which is derived from flux and silica which are melted together and reground into a fine powder.

Girl-in-a-Swing Factory

(1749 - 1754) Early English porcelain, probably made in London. The name arises from a white figure of a girl in a swing in the Victoria and Albert Museum.

Glaze

A thin coating of glass. An impervious silicate coating, which is developed in clay ware by the fusion under heat of inorganic materials.
Applied to porcelain or pottery body to make it waterproof and enhance colour. Glazes may be clear, opaque or coloured to various degrees.
 [ See Lead Glaze and Salt Glaze ]

Glaze firing

The final firing, with glaze.

Glost ware

A biscuit that has had a glaze applied. Also called white glost or white ware.

Grog

Ground up fragments of already fired clay, then used to give a grogged surface.

Greenware

Unfired pottery. Ready to be bisque fired.

Hollow Ware

Table wares that have significant depth and volume, e.g., cups, bowls, teapots, creamers, and tureens.

Incised

Marking leatherhard clay for decorative purposes or to apply a mark

Ironstone

The name "Ironstone China" was adopted by C.J. Mason in 1813 to describe a formula similar to that of stone china. Today, the name is equivalent to earthenware.

Jasper Ware

The familiar densely uniform stone ware in solid colours ornamented in a contrasting hue was Josiah Wedgwood's most important contribution to ceramic art. It was the ability of this new ceramic material to take an admixture of uniform colour that gave the wide range of combinations that mark the development of the range of decorative wares that Wedgwood and his successors at the Wedgwood potteries made into their trademark product.

Jigger

Machine for making plates, saucers and other flatware.

Jolley

Machine for making cups, bowls and other hollow ware.

Kiln

A furnace of refractory clay bricks for firing pottery and for fusing glass.
[See Bottle Kiln}

Kiln Furniture

Refractory posts and shelves used for stacking pottery in the kiln for firing.

Kiln Wash

Mixture of Kaolin, flint and water. It is painted on one side of the kiln shelves to separate any glaze drips from the shelf.

Lead Glaze

Transparent glassy glaze using lead oxide. Often applied to early English soft-paste and earthen wares.

Leather Hard

Stage of the clay between plastic and bone dry. Clay is still damp enough to join it to other pieces using slip. For example, this is the stage handles are applied to mugs.

Lustreware

An English ceramic decoration with pigments containing minute quantities of gold or platinum.