The under glaze red is also one of the varieties of the under glaze decorations in the traditional porcelains of our country The principal coloring agent of the under glaze red is the copper oxide , locally called the copper motif After formulatingit i painted on the biscuit as a decoration coated by a layer of transparent glazeIt looks red in color under the glazeIt is one of the most famous varieties of the Jingdezhen porcelains which have enjoyed great reputation and produced great influencesThe under glaze redthough originating in Changsha Kiln in the Tang Dynastydeveloped and flourished in Jingdezhen in the Yuan Dynasty and became the most representative decoration in Jingdezhen

The under glaze red varies in the field of color generation;It normally has a color hue of bright redbut sometimes of grayish red or light red with green or blue white dots or blocks;The red is sometimes surrounded by the hue of light red around itjust like the effect on the Xuan Paper;It sometimes even produces the yellow hue;It is no wonder that the same coloring pigment is able to produce rich colors under the under glaze influences in the flames and people are astonished at the magic products of the clay and fire;

The skills of painting decoration with the under glaze red have some similarities to those of the under glaze blue decoration;It is usually applied in combination with the blue-and-white in the normal practices of decorating the porcelain wares ;Thusit is called ;the under glaze blue and under glaze red; and ;the under glaze red; when it is applied alone ;It has two methods of application the one is to apply the color pigment directly to the biscuit and coat the blue and white followed by firing in a kiln ;the other is to apply a thin layer of the blue-and-white glaze to the biscuit as the ground glaze before decorating with the under glaze red followed by the coating glaze before firing in a kiln ;The color pigment develops between two layers of ;qingbai; glaze so that it is called ;the under glaze red;Such a method was mainly applied to the early under glaze red wares ;Thereforesome potters called the under glaze red as the forerunner of the in glaze decoration; The current decorative techniques are to apply decoration directly to the biscuit ;The under glaze red applied directly to the biscuit has good lines as it has low fluidity .But its color generation is not so good and it has a high fluidity in the glaze so that potters are used to apply xieyi (freehand )brushing decoration at present.