(1) Minru porcelain (about the early Northern Song Dynasty - Jin Dynasty)

   1. Start-up period: early Northern Song Dynasty。White porcelain is mainly fired, and a small amount of celadon and black porcelain are also fired。Celadon glaze is very thin, the glaze color is not stable, showing a light blue color。The main objects are plain face, and only a few printed chrysanthemums and other decorations are seen。

   2. Development period: Mid-Northern Song Dynasty。It is still dominated by white porcelain, but the number of celadon increases significantly, the glaze is uniform, the glaze layer becomes thicker, and the new lotus, peony, vertical stripes and convex lines appear on the decoration。

   3. Peak period: Late Northern Song Dynasty。Celadon not only exceeds white porcelain in quantity, but also has various types and complicated patterns. The glaze color is mainly bean green and bean green, and there is also a small amount of azure glaze porcelain, which adds printed dragon pattern, engraved peony and seawater swimming fish to the decoration, and scratches and prints on the same object, that is, scratches on the surface and prints in the instrument。In addition to printing, plain ware generally does not use molding, and is mostly made by hand drawing process。

   4, decline period: Jin, Yuan period。Celadon glaze becomes darker, glaze lacks luster, there are small brown spots in the glaze layer, the shape of the ware increases, the wall is thickened, and the body appears rough。

(二)官汝瓷(约宋哲宗元佑元年1086年——宋徽宗崇宁五年1106年间共20年)

   1. The first stage: the burning stage。Both the firing of full glaze branch burning azure glaze porcelain, nail strong, but also the firing of bean green and bean green glaze engraved, printed porcelain。

   2, the second stage: mature stage。Azure glaze porcelain accounts for more than 99% of all porcelain, and the Ru porcelain has been handed down to the world, and some new types of ware have appeared。Many of them, whether plain or decorated, mostly use molding, such as washing, plates, bowls, POTS, dishes, furnaces and some bowls, cups, boxes, etc., the outer wall of the ware is decorated with an outer mold, and the inner and outer walls are not decorated with an inner mold, the wall thickness is uniform, the nails are small and sharp, and the process is very fine。Large objects or objects inconvenient to use molds, such as all kinds of bottles, bottles, caps, etc., are mainly hand-pulled billet technology。At this time, there are a lot of support ring cushion burning objects。