Crystalline glazes:
It's a specific glaze, once very popular in the beginning of the 20th century, in the factories of Sèvres or Pierrefonds. Fallen in disuse, it has reappeared in some modern studios
Mine is mainly made of zinc and fired up to 2300°F. The cooling process is slowed down around 2100°F to allow crystals to grow. Then, the temperature is stabilized to obtain halos.
Colours changes and pearly appearance are obtained by creating a smoked out atmosphere in the kiln.
Development of crystals is still excitingly unpredictable, ending either in good surprises or in disappointment...