Blue underglaze red porcelain glaze color varieties, blue and white is a high temperature underglaze decoration, metal cobalt colorants, will cover transparent glaze firing temperature was a beautiful blue. The underglaze red is a high temperature underglaze decoration, as a coloring agent to copper, blue and white decoration and firing techniques and the same. This will be blue and white, underglaze red and white device with applied decoration in blue underglaze red method will be called.

As the coloring agent is cobalt blue and white, underglaze red coloring agent is copper, the two are different in nature, firing temperature and kiln room atmosphere of the requirements are different, and thus are applied to a device, and the red and blue coloring are just right not an easy task. Underglaze red coloration due to the firing atmosphere of the pros and cons vary, and some bright red, and some deep, dark, into the purple, and some pale yellow, some black as in black enamel, only from the pattern of faint lines where the edge to see a little red blooming. As the copper active, particularly sensitive to the firing atmosphere, the cobalt-blue than the blue dip diffuse halo more easily scattered. Some slight dip diffuse pattern, but a clear pattern of infiltration of the red from the contrast effect, since the Yuan Dynasty, Jingdezhen has been fired in the kiln, the Ming and Qing Jie firing.

Blue underglaze red burn on the yuan before the mid-Jingdezhen. Yuan Dynasty blue and white underglaze red during firing in the record level of burning is not high, the coloration is not pure. Then raise the level of firing, can successfully create blue underglaze red burn, whether it is blue hair color, or the coloring and Red are more pure. To the late Yuan Dynasty, with social unrest, economic recession, the porcelain firing inevitably be affected, they appear like the original and Red coloring is not bright, or gray, black phenomenon, blue and white coloring also by the bright and dark tones of indigo into. (more…)