|Monthly Tech-Tip |
Underglaze brushstrokes were applied to this cup at the leather hard stage (lower left). It was then bisque fired. On the lower right a ball of the pure underglaze emerged from the same bisque firing, notice that although not melting as much as a glaze, it is certainly fusing enough to seal the surface of the bisque where applied. Notice what happens on the upper right: The bisque piece was immersed in a dipping glaze for a few seconds - the underglaze is not covering. On the upper right a transparent brushing glaze has been applied over the underglaze brushstrokes. Notice that it has covered. But three coats were needed with plenty of drying time between them, especially over the brushstrokes.
A intensely pigmented and highly opaque brushing compound meant to be applied to leather hard pottery and covered with a transparent overglaze.