Underglaze colours white use as a base colour on greenware or bisqueware they can be used at earthenware or stoneware temperatures making them doubly versatile apply two or three layers to build up a matt colour bring the colours to life with a gloss finish spray brush or dip into a clear earthenware or stoneware glaze our swatches show the colours coated with a clear gloss glaze stir well prior to use these glazes are safe for dinnerware as they are non toxic and lead freefiring ra