Chinese ceramics were admired in Iraq for their shiny white surfaces and hard body. As neither the essential raw materials nor the appropriate firing technology were locally available, Islamic potters therefore created their own versions by covering finely potted yellow clay hemispherical bowls with a glaze that turned opaque after firing, creating ceramics that were described as "pearl cups like the moon." This technique offered the potters an ideal canvas for bold decorative designs, first in cobalt blue and then with "luster"; mixtures of copper and silver that were painted onto the glaze then fixed in a second firing.
Lee Love