“Chosen-karatsu” is a kind of Karatsu-yaki. Usually, black glaze is “iron glaze” containing iron and white glaze is “straw ash glaze” which becomes milky. The old one is Momoyama period style. Many Chosenen-katsu are also being made in the present day. A beautiful piece of black and white is a ceramic art vase of Karatsu. All materials(soil, ash, clay etc) are selected and mixed by the potter.