Apparently people want to understand how I make terra sigillata. My method, because of lengthy-time Ceramics specialist at Emily Carr U, Gail Carney, is low-tech and doesn’t involve chemical wizardry, just scales, a calculating jug and 2 large buckets. I've got a feeling a few of the terra sig experts will dsicover my method too unscientific however it produces things i want. Here is copied from the recipe hands-out for workshops.
To contrast using the very shiny glazed areas I love to use terra sigillata on certain parts. I paint it onto bone-dry work, especially underneath.
Redart Clay powder 2 kg
Calgon water softener 3gm
Dissolve calgon inside a little tepid to warm water, mix using the clay and water, sieve and then leave to have an hour. Then pour into another bucket every 20 minutes, discarding the underside sludge, until there's very little residue. The following day is simply too late to carry on. The watery effect can result in left to evaporate or include a large pot around the stove to bubble away the surplus water. Stir and apply having a brush to bone-dry ware in a number of thin layers. Containers could be drizzled with terra sig or sprayed. It ought to be fairly thin, like 1 % milk. For any nice shine buff having a ball of scrunched-up thin plastic immediately after application. When the terra sig is simply too thick, just like a slip, it might spall off.
Goldart Terra Sigillata
Goldart Clay powder 500gm
Good off-white-colored along with a grounds for other colours, usually stains.