The body is red-burning Plainsman M390. The firing was dropped and soaked at 2100F for 30 minutes and then dropping at 300F/hr to 1400F. This really helps to produce a dazzling defect free surface. These are, of course, mix-your-own recipes and the pieces were dipped to get perfectly even coverage.
GR6-M - Ravenscrag Cone 6 Floating Blue
Plainsman Cone 6 Ravenscrag Slip based version of the popular floating blue recipe. It can be found among others at http://ravenscrag.com.