It's slipcast. Several years ago, when my back problem was much worse, I couldn't work on the potter's wheel. I decided to try slipcasting. I made several of my own molds from either found objects or my own work. The mold for this one was made from old convex oval glass taken from a large picture frame. After the cast plate dries to leatherhard I apply a thick layer of slurry to the front of it. After that sets for a while, I go back and use my fingers to do the swirl patterns. Takes a week or more for that to slowly dry. The plate is bisque fired to Cone 06, followed by at least two more successive glaze firings at Cone 05. Sometimes I use my own glazes, sometimes commercial ones.
A funny aside. 25 years ago I didn't have my own kilns so I had to take my work (not these) to a local ceramic shop to get fired. It was very, ummmmm, "unusual" sculptural stuff and the very PROPER ladies at the shop considered me to be some kind of lunatic!
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