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STAGES OF CLAY

STAGES OF CLAY. 1. Plastic-ware -. Clay that is soft, pliable and easy to work with. Right out of the bag or the pug mill. Dark Gray, Cold You can: wedge, sculpt, form, connect pieces without wedging You cannot: Fire, Carve. 2. Leather-hard -.

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STAGES OF CLAY

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  1. STAGES OF CLAY

  2. 1. Plastic-ware- Clay that is soft, pliable and easy to work with. Right out of the bag or the pug mill. Dark Gray, Cold You can: wedge, sculpt, form, connect pieces without wedging You cannot: Fire, Carve

  3. 2. Leather-hard- Clay that has been allowed to dry slightly, making it stiffer and able to support its weight, but can still be worked on and have parts attached Color/temp: Slightly lighter, cool to the touch Can: Connect clay to clay via score and slip, can Carve, recycle Cannot: Fire, manipulate or bend, wedge

  4. 3. Bone dry- Clay that has been allowed to dry all the way so that all of the moisture is gone and it is ready to fire the first time. The clay feels room temperature and slightly chalky/powdery Can: Fire, Recycle it, Apply under-glaze Cannot: Manipulate or form, Cannot connect pieces, no wedging!

  5. 4. Greenware • All stages that have not yet been fired: • Plastic, leather, and bone dry

  6. 5. Bisque ware- The first firing for the clay, removes all of the water, (both actual and chemical) and carbon, The fusing of the particles has begun, yet the clay is still porous to allow for glaze absorption. Porous Rock like material- Lighter, harder It can no longer be slaked down and recycled.

  7. 6. Glaze ware- The second firing of the clay with a coating of glaze upon its surface, it is fired to a higher temperature than bisque and therefore fuses the particles into a solid, non-porous state called vitrification.

  8. What is a CONE? • Temperature measurement system • BISQUE: ^ 06 = 1865 degrees • MID FIRE GLAZE: ^6 = 2195 • HIGH FIRE GLAZE: ^9-10 = 2400-3200 degrees

  9. What is a Glaze? • A combination of flux, opacifiers, and oxides that is painted on bisque ware in liquid form and melts/transforms in the kiln and turns into a glass like surface.

  10. FLUX:The ingredient that controls the melting temperature- Feldspar, Gerstley Borate, Lead (white and red) • OPACIFIERS: • Transparent- can see through • Translucent: Ability to absorb light • Opaque: Ability to reflect light • Different clay bodies • OXIDES: • This is the material in the glaze that adds color. Can be used just with water to create a stain. • Red Iron Oxide: Reds, Blacks, Browns • Cobalt Oxide: Blues, Greens

  11. Engobes/Slips/ Underglazes • A Clay like body (substance) normally the consistency of heavy cream, with or with out color • Applied to green-ware (work that has not yet been fired, leather hard or bone dry) • Made up of: 10% Feldspar 35% Ballclay 5% Silica

  12. What are some basic Glaze Application Techniques? • POUR • Use a small clean container to pour the glaze into and on your pottery • DUNK • Hold you piece under the glaze for at least 10 seconds for 1 layer, 5 seconds for a second layer • BRUSH • Use a clean brush to apply glaze in thick even strokes, do not wipe the brush back and forth, just apply in one direction- • Allow each layer to dry • Apply at least 3 layers

  13. Types of Glazes in Studio 201 • Oxides: Red iron oxide, copper oxide, chrome • Underglazes: (Applied to green-ware only) • Glazes- All cone 6- MID FIRE GLAZE: ^6 = 2195 • Gloss Glazes • Opaque: Red, Yellow, Orange, Blues, Ohata Red • transparent: Celedon Green, Hot Orchid, • Textural Sculptural • Jade, Purple Sand, Cinnamon, • Crackle • Bright and Pale Blue • Amber

  14. TANG DYNASTY (618-907) Pinecone Glazed Pottery Vases Wild Wings Pottery co. 1) Apply oxide or under-glaze on the outer surface of your bowl and remove excess with a damp sponge. 2) Apply a cone 04 gloss glaze on the inside using a brush. 3) Make a map of your work and keep a glaze record for everything you glaze

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