An Introduction to Clay. What is clay? Clay = earth + water Silica - an essential ingredient in clay and glazes. When melted, becomes glass. Clay can.

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Presentation transcript:

An Introduction to Clay

What is clay?

Clay = earth + water Silica - an essential ingredient in clay and glazes. When melted, becomes glass. Clay can also contain: Grog – ground up, fired clay or sand. Makes clay feel gritty. Iron oxide (red clay only) Other minerals

More basic clay vocabulary kiln - super hot oven where clay is fired cone - temperature at which clay or glaze needs to be fired. Lower numbers are hotter (i.e., cone 4 is hotter than cone 6) vitrifying / vitrification- clay particles melt together to become glass-like and less porous Earthenware - fires at relatively low temperature (cone 4-6, about degrees F). Porous when fired. (other kinds of clay include porcelain and stoneware)

Stages of Clay 1. Slip - watered down clay; muddy 2. Plastic - workable stage; can be recycled; can join to other pieces 3. Leather Hard - stiff and will hold its shape; join to other pieces; carve into; recycle 4. Greenware or bone dry; very fragile; can be recycled 5. Bisqueware - fired once in kiln; cannot be recycled; ready to be glazed 6. Glazeware - second fire-low fire; cannot be recycled

Silica dust is harmful when inhaled! Silicosis - causes swelling in lungs, shortness of breath. Severe cases may need lung transplant. Carcinogen - can cause cancer

How do we keep our studio safe?

Safety & Clean-up Protocols * Sand outside * Clean up with damp rag or sponge * Clean sponges often (squeeze under the faucet) * Never sweep up or vacuum clay dust * Do not blow on clay dust

I SITS ON DUSTPAN SO U NO GET SILLY-COSIS clay kitteh sez:

Working with the Slab slab - rolled out clay slab roller rolling pin/slats

surface treatment: texture

Slab mugs by Elaine Pinkernell Tiles by Susan Cohen Thompson Slab box by high school student

Fountain by Mary Holden-Hall Ceramic basket by Shuji Ikeda Slab sculpture by Jayne Avery

Today's mission: * Become more familiar with clay studio * Use studio equipment to roll slabs * First slab assignment: construct a tile or trivet Later: Basic students: Create a mug using slab technique Advanced students: Design independent projects that involve slab technique Much later: basic firing & glazing