Cone 6 oxidation (larger image): Gray Opal creates a transparent gloss finish. It deepens in color from one coat to three but surface decoration and design remain visible through theglaze even with three coats. The glaze will break and pool around surface textures, creating opportunities for the opalescent character to develop.
Cone 10 reduction (smaller image): Color lightens; becomes more transparent.
TIP: One coat allows more of the clay body characteristics to appear through the glaze, adding a faint color gloss to the surface. Subsequent coats deepen the amber color but at three coats you will still obtain a translucent fired surface. Three+ coats will produce more opacity and less translucency. Heavy application may increase the incidence of crazing.