Lustreware

Pottery with a reflective or iridescent surface

Lustreware or lusterware is a type of pottery or porcelain with a metallic glaze that gives the effect of iridescence. It is produced by metallic oxides in an overglaze finish, which is given a second firing at a lower temperature in a "muffle kiln", or a reduction kiln, excluding oxygen.

This keyword could refer to multiple things. Here are some suggestions: