I used Creaton 246, fire range 1000-1280 degrees. I bought it in the same shop that fired the statues.
I was talking about armatures because I made them to hold on a vertical body while working on it. When it was leather dry I cut the statue, removed the wire and reassembled the statue back.
I used the term terracotta because that's what it means in Italian, fired earth/clay. I suppose that's also called bisque, the first time something comes out of the kiln.