all about pottery!. what is pottery? pottery: – all fired ceramic wares or materials which, when...
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What is pottery?
• Pottery:– All fired ceramic wares
or materials which, when shaped, contain a significant amount of clay.
– (Ware is another word for pottery)
What exactly is clay?
• Clay: – particles of decomposed
rock combined with water that create a flexible body which is then fired in a kiln to fuse the particles back into a stone-like state.
STAGES OF CLAY
1. Slip 2. Plastic3. Leather-hard 4. Bone dry
• Clay goes through four different stages in the process of making any pottery. Those four stages are……
#1: Slip
• Slip is liquid clay.• It is a thick and creamy
mixture of clay and water.
• You will use slip to join clay parts together or to decorate the surface.
• It is applied before firing, when the clay is still wet.
#2: Plastic
• Plastic Clay is soft, bendable and easy to work with.
• This is the stage the clay you will be using is at.
#3: Leather-hard
• Leather-hard Clay 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.
#4: Bone-dry
• Bone-dry clay is completely air-dried, but not yet fired.– You cannot add any
more clay or mold it at this point.
How to make a piece of pottery:Hand-building
• Hand-building: – the technique of
building pots using only your hands and simple tools.
Pinch Pot
• The process of starting with a ball of clay, inserting your thumb and "pinching" the clay between your thumb and fingers, gradually expanding and shaping the wall into a bowl-like form.
Slab Building• Slab building uses thin
sheets of clay to build a structure, the sheets can be either rolled or stretched out.
• They can be manipulated while plastic and formed around molds or while leather-hard and construct the form from shapes cut from the sheet.
Coil Pots(This is the handbuilding technique you will use)
• This is the technique of building ceramic forms by rolling out coils, or ropes, of clay and joining them together, one on top of the other, with the fingers or a tool.
Firing your Pottery
• Once you have completed your pottery, it will be fired in a kiln.– Firing is the process of heating the pottery to a specific
temperature in order to bring about a particular change in the clay or the surface.
– A kiln is a furnace in which ceramic pieces and some other clay materials are baked, burned, dried or melted. The temperature in some kilns reaches more than 3000 degrees Fahrenheit.
• Potters fire or bake ceramics in kilns to give the pieces permanent shape.
Firing Processes• Greenware: pottery that has not been fired • Bisqueware: Pottery that has been fired once, but
not glazed. • Glazeware: pottery that has been painted or
dipped in glaze and fired.• Glaze: Glazes are a finely ground mixture of
mineral and man-made powders tuned to melt and flow at a specific temperature.
Art I Pottery Assignment
• You must create a pot using the coil method.– You Choose One of the following:
• Keep coil designs are part of the decoration.• Smooth out the coils to create a smooth surface.
– You must attach a handle, lid or another type of attachment.
– You must add additional decorations.– The vessel must be at least 5 inches tall.– All finished pottery must be glazed (needs 3 coats before
being fired).– Vessel must be constructed neatly and be stable.
The First thing you have to do when you begin…wedge your clay
• Wedging is preparing clay for you to be able to use and work with.– The purpose of wedging:
• remove air bubbles• add water• removed excess water
– The lump of clay is repeatedly thrown down on a flat surface.
– You will knead it by rocking, in a spiral motion to create a uniform consistency.
Place the first coil on the base of your pot, then weld the coil and bottom piece together with
your fingers.
When coil-building pottery, the last clay coil for the pot is slightly thinner and tapers to a point.