Blue and White Porcelain The blue and white style,also known as'under glaze blue' is created by drawing the design withcobalt pigment onto the stoneware body,and painting over it with a transparent glaze.The piece is then fired at a high temnperature.Blue and white porcelain was introduced during the Yuan Dynasty and has been continuously in production ever since,thanks to its bright colors,simple but elegant patterns,and smooot glaze that never fades.