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Transcript of Clay Introduction
Clay is a hydrous silicate of alumina that...
1. Can be manipulated (formed) when wet.
2. Holds its shape when dry.
3. Is made permanent when fired to the appropriate temperature.
Stages of Clay
Leather Hard means that the clay is almost dry. It is very strong and holds its shape.
It is important to know what stage your clay is in so you know what you can do with it!
Some forming methods with wet clay
The definition of Clay
Molding and forming with your hands...like a pinch pot
What do you do with leather hard clay?
What to do with Bone Dry clay......FIRE IT!
You connect it!
Scratch the surfaces that will be joined
Add slip to act like glue between the surfaces
....Then you glaze it!
Glaze is the shiny coating that is put on ceramics. They are made of the same materials as clay...just in different proportions, plus colorants. Glazes are suspensions....you must remember to shake or stir!
Clay is fired at different temperatures that are appropriate for the clay. For example....we use cone 06 clay and it is fired to around 1800 degrees.
Dos and Don'ts
Cover your clay when you are finished working....wet and work in progress.
Keep your area clean
Score and slip to connect clay to clay
Put clay in the sink.
Make anything thicker or thinner than your thumb.
Glaze the bottom of your work.
Crazy Coil Pots
Pinch Pot Monsters
Slab Construction Houses
Pottery In History