What is "lusterware"

n. A type of pottery having an iridescent metallic glaze

n. pottery with a metallic sheen produced by adding metallic oxides to the glaze

Lusterware or Lustreware (respectively the US and all other English spellings) is a type of pottery or porcelain with a metallic glaze that gives the effect of iridescence, produced by metallic oxides in an overglaze finish, which is given a second firing at a lower temperature in a " muffle kiln", reduction kiln, which excludes oxygen.