How Clay is Formed
Types of Rock which clay is formed
Extrusive igneous blew out fo the earth and cooled quickly
Bisque Cone and Temp:
Low fire cone and Temp:
Mid fire cone and Temp:
Hight fire cone and temp:
What is 09 1725, 04 1945, 6 2232, 10 2350.
This is a higher water content to a single oxide. This is used for rubbing or brushing onto an object. It can range from very dark in higher concentration, to light from a lighter application.
What is a wash?
This flaw is caused by not burning out all the organic materials between 400-800 degrees
What is Carbon Coring
This gas kiln is what we have here. The chimney hole is on the bottom of the kiln. It allows for heat to circle through the top to the bottom.
Down Draft Kiln
Primary clay
Weathered and stayed at the source. It is short and not as plastic, whiter in color. Rain and Wind.
Name the cones in a pack
Guide, Target, Guard.
This has the highest content of clay of any finish. It combines water and clay sometimes with a colorant to use ONLY on greenware.
What is a slip.
This glaze flaw caused by cracking during the cooling down phase. The ceramic cooled down to quickly, either by opening the kiln too quickly or talking it out of the fire too fast. As in raku.
___________Has less oxygen available and thus snatches it from the ceramic objects.
Oxidation.
Reduction.
Transported away form source. Through wind glaciers water
More plastic,
OM4 ball clay, gold art, fire clay. Darker in color.
Primary Fluxes
Lithium, Potassium, Sodium
Meaning Sealed earth, this finish has the finest of particles which can be brushed and burnished on a greenware piece.
What is Terra Sigillata?
This glaze flaw is when tiny holes form in the glaze, when trapped gases from the ceramic body, try to escape from under the glaze.
What is pin holing.
To achieve a more exact absorption figure, weigh several fired test bars, then place them in boiling water. After two hours, remove the bars from the water, pat all sides dry of surface water, and weigh the bars on a laboratory scale.
Hexagonal shapes, platelets you can stack. flat attract each other.
Major Opacifiers
Tin Oxide, Zinc, Titanium Oxide.
The European slippery cousin of slip, has more clay content, but also includes a flux and must be applied on bisque ware, not greenware.
What is a Engobe.
What is Leaching?
How do Iron and Copper react in oxidation vs reduction atmospheres?
Iron
Oxidation- turns tan, browns, yellows, and oranges
Reduction- Translucent blues and greens
Copper
Oxidation- Green
Reduction - Red
Al2O3 +2SiO2+2H2O
Secondary Flux
Calcium, Barium, Magnesium, Lead Strontuium
This ingredient, produces bright colors, through a manufacturing process of crushing, refining and crushing again. This ingredient is made to work at most tempetures. Mason is the most popular.
What is a stain?
This glaze flaw is when a glaze pulls away from the clay body and forms bumps, or islands on the clay body, it can be caused by dust not being removed from an object or the glaze has a high shrink rate that does not match the clay body.
What is Crawling?
What is a coffin and why are they used?
They are boxes made of clay that will survive the firing process. They are used to hold the clay so they won't adhere to the kiln shelves and ruin them. Catch melty things