A lot of potters make beautiful pots with only one glaze, or a couple of glazes dipped, poured or sprayed in combination. On the other hand, a lot of other potters make very beautiful pottery with painted or slip-trailed decoration. It is often difficult to make a pot come alive with only a single glaze.
Pottery can be decorated with a glaze or underglaze. The basic technique of resist inlay is to coat the surface of your piece with glaze or underglaze, cover with liquid wax resist, scratch your design through the wax and then brush a second color of glaze or underglaze over the incised design.