Figure 29a-b. Detail of dark blue areas with scattered dark particles that are the undissolved portion of the cobalt mineral colorant (left), and bubbles formed during firing from reaction of the colorant mixture (right).
Figure 29a-b. Detail of dark blue areas with scattered dark particles that are the undissolved portion of the cobalt mineral colorant (left), and bubbles formed during firing from reaction of the colorant mixture (right).