Presentation on theme: "Clay Stages. Clay Stages - what? The nature of clay changes with its moisture content. Its physical properties and possibilities change progressively."— Presentation transcript:
Clay Stages - what? The nature of clay changes with its moisture content. Its physical properties and possibilities change progressively as it dries. Unprepared clay in its natural state is called raw clay
Stage 1 Slip Clay and water mixed to produce a liquid More water added = more shrinkage Sometimes used as a decoration: –Colored Slips –Engobes Can be poured
Stage 2 Slurry Very thick slip Used as a glue for sticking two pieces of leather hard clay together Not thin enough to be poured, but thick enough to stick to your fingers
Stage 3 Plastic Sufficiently hard and dry to allow modeling and manipulation Right out of the bag Does not stick to your fingers and can be manipulated. This clay has the consistency of bread dough
Stage 4 Leather Hard Partly dry clay Feels solid, yet may be cut, carved, stamped, and stuck together with slurry Can not be manipulated like bread dough, but can still have more clay attached to it
Stage 5 Green ware Dry, unfired work Lost weight and shrunk Color has changed and the clay can no longer be joined together Can no longer have more clay attached to it, but will dissolve and turn to slip This is the last stage of clay that can be recycled!!!!!!!!
Stage 6 Bisque First kiln fire Complete change in nature and color Retains shape in water and is now porous Can now be decorated with glazes Will not dissolve in water, but will let water pass through it
Stage 7 Mature Second, glaze fire Hard, rock-like Vitrified Water will not pass through it
Clay Stages, why is knowing about them important to potters?