Slip Casting is made from slurry clay with plaster molds split into 2 or 3 pieces.
First, fill the plaster mold with slurry clay.
Wait for 15 – 30 mins till the mold absorbs water from clay.
Plaster has the property of absorbing water.
Slurry clay will be like a film paralleled to plaster wall.
Then open the mold, the remaining clay film becomes a vessel.
A vessel still has extra parts called casting blowhole and burr.
Need to modify them.
Time to make.
The slip casting step takes an hour for one vessel.
But making set of plaster molds takes around a year.
I like to paint inside with vivid colors.