Mayco UG225 Plum Opaque Underglaze Aprons Centering rings can be drawn

Centering rings can be drawn on the surface with a Sharpie (which can be washed off later)

Handcrafted hardwood handle measures 12 mm x 12 mm x 16 cm

An iron and manganese bearing clay used in underglazes

P29 Round Slope Relief-Carving Tool

The problem is that many people make false assumptions (sometimes induced through advertising) about the true function and capabilities of overhead vents marketed for kilns

Mayco UG225 Plum Opaque Underglaze Aprons Centering rings can be drawnFor use on clay or greenware: apply one or two coats and let dry and bisque fire to shelf cone 04. If desired, apply a clear or colored translucent glaze and fire to cone 06. For use on bisque: apply one or two coats and let dry. Apply a clear or other colored translucent glaze and fire to cone 06.