Note the redder appearance? I figured out I could get all kinds of different colors if I first sprayed the porcelain with my oribe glaze -- basically coat it with lots of copper.
These were some of the bowls I did for the Goshen Empty Bowls a couple of years ago. One third were lined in oribe, one third in cobalt, and one third plain.
Celadon is hard to photograph, but again you can see the depth of color added when sprayed with oribe glaze first.