clay stages. clay stages - what? the nature of clay changes with its moisture content. its physical...
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Clay StagesClay StagesClay StagesClay Stages
Clay Stages - what?Clay Stages - what? The nature of clay
changes with it’s moisture content.
It’s physical properties and possibilities change progressively as it dries.
Unprepared clay in it’s natural state is called
raw clay
Stage 1 SlipStage 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 SlurryStage 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 PlasticStage 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 HardStage 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 wareStage 5 Green ware Dry, unfired work Lost weight and
shrunk Color has changed and
the clay can no longer be joined togetherCan 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 BisqueStage 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 MatureStage 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?
Clay Stages, why is knowing about them important to potters?