Copper lustre
This colour can be described as copper, bronze or gold. In addition to conventional decoration, many copper lustre patterns incorporated, or exhibited exclusive, 'resist' decoration: a clay compound is applied to parts of the pot before covering all over with the lustre pigment. After firing, the pot can be scrubbed and the areas which have resisted the lustre bond reveal the natural clay body beneath. The small jug and the tray (rear left of the photograph) both exhibit this 'resist' technique.
Gray's Pottery products having a print plus copper bands and lines will be found in the 'Print only' classification.
Link: Full sized image