I apply dry greenware for a soft subtle color...bisque fire then glaze with a clear glaze and glaze fire. I found if I applied to the bisque and applied glaze over it. The glaze seemed to wash out the oxide somewhat, and since this is a subtle effect anyhow it left it pretty washed out indeed. So now I do the oxides on the greenware and the bisque firing sets the subtle coloring into the clay. I do not wipe them off though, Just gently brush on the oxide and it settles darker in the cracks and crevices of the pieces quite naturally..leaving the smooth areas much lighter.