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Clay VocabularyClay Vocabulary

States of Clay

Clay- a moist earth of decomposed rock; used in products such as pottery,bricks, tiles, and sculpture

Leather hard- unfired clay that isnt quite dry, yet firm enough to carve orburnish

Greenware/ Bone Dry- unfired clay that is free of water and ready to fire; clayin its most fragile state

(Apply underglaze at this stage)

Firing- making clay products permanent through baking at hightemperatures in a kiln

Bisque- clay that has been fired once

(Apply overglaze at this stage)

Ceramic-clay products that have been fired for permanence

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Types of Clay

Earthenware- low-fire pottery, usually red or tan, that hasbeen fired to below 2,000 degrees F

Stoneware- (gray/white)- usually high fired above 2000degrees F

Porcelain- White, high talc content, can be very strongAND very thin

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Building Vocabulary

Wedging- kneading moist clay to eliminate air bubblesand produce a uniform texture

Additive(+) /Deductive(-)

+ Coil- snake- like piece of clay, process for building

+ Slab- clay evenly rolled and formed by draping orjoining

(pancake-like piece)

Tools- Needle Cutter Rolling Pin

Knife Extruder Canvas Mat

Paddle Loop Tools

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Slip- Very wet clay used as a glue toattach 2 pieces of clay

Scoring- making marks on the edges of 2pieces before joining with slip

Weld- successfully joining 2 pieces

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Glazing

Underglaze- colors that can be painted on

greenware that will show through a clear glaze

Overglaze- colors that can be painted onbisqueware which result in a shiny glass-like

surface after firing

UnderGlaze OverGlaze

Before Firing After Firing

Matte Shiny

More Control Less Control