A glaze made with varying proportions of wood or vegetation-derived ash, sometimes together with clay, feldspars and other minerals. Different ashes impart their own distinctive colors and textures to glazes.
Used on stonewares as a decorative glaze, derived from vegetable ashes and varying widely. Most contain potash, lime, silica, and alumina. These are also referred to as alkaline glazes, typical examples of which can be seen on the American face jugs of the Carolinas and Georgia.