Song Da flipped out another photo from his mobile phone: "Look at this Jianzhan, the sharp edge is long and sharp, light brown to silver, and the arrangement is sparse. There is also this one, which has round, larger markings and is brown. 'Oil droplets' and 'stars' are both subjective descriptions of partridge spots in Japan, and the Japanese side also refers to the rabbit as 'hemu (rice ears)'. ”

Lan Eucalyptus blinked in surprise, "'Star'? It's so romantic! ”

Song Da continued: "The term 'star' may come from the record in the 'Juntai Guan Left and Right Accounts', while the oil drop is more mainstream. The name of the oil drip cup is Hoshiken Cup, which is a saying handed down by the Tokugawa family. The oil droplets in the photo are small and dense, which is very beautiful. The buckle edge is a flat buckle method, which is rare in the Japanese Tibetan cup. ”

Lan Yu nodded, "Uncle, I really gained a lot from chatting with you." I used to search for Jianzhan on Taobao, but I always felt that it was not quite the same as the one in your store. ”

Song Da waved his hand, "What is sold on Taobao is not actually Jianzhan, it is just selling dog meat with a sheep's head." In recent years, the artistic value and historical and cultural value of Jianzhan have been recognized by more and more people, not only the old Zhan, but also many new Zhan of good quality, and the price is also rising. The firing of Jianzhan pays attention to the kung fu in the kiln, the yield is very low, each one is different, has its own personality, many friends who have just started do not know how to choose Jianzhan. ”

Lan Eucalyptus was a little puzzled, "Then how do you choose Jianzhan?" ”

Song Da generously taught, "If we want to choose a Jianzhan, we must first base ourselves on the fundamentals and consider the essential characteristics and necessary characteristics of Jianzhan, that is, iron tires, we must remember that without iron tires, we will not build a lamp." The iron tire is mainly made of Jianyang Shuiji's local high-speed iron laterite as raw material, and the iron content is higher than that of other kilns.

"Most of the other kilns are made of yellowish-white kaolin, which contains little iron and more aluminum, and is made of porcelain. Iron tires are heavier, refractory and plasticity are not as good as porcelain tires, and porcelain tires can avoid problems such as deformation and cracking that iron tires will have, and one of the reasons for the low yield of building lamps is because of this.

"It's not an iron tire, but also a matter of pretending to be an iron tire, which existed in the Song Dynasty, and painted the exposed part with makeup soil and the white tire black. In modern times, even if you don't apply professional makeup soil, you can apply dilute glaze water and thick iron red water, and the surface looks like an iron tire after burning. ”

Lan Eucalyptus was even more confused, "But how do we laymen judge iron tires?" ”

Song Da replied very professionally: "Judging the iron tire, it is necessary to judge the color, texture, sound, density and other factors, such as the fair-skinned, delicate, light and thin tire is obviously not Jianzhan, but the color of the iron tire is not only dark gray, and some new iron tires will be reddish-brown because of the oxidation of the atmosphere; Lao Zhan may also become reddish-brown or yellow-brown because of the soil. In both cases, if you knock on the opening along the slightest specimen, the inside is dark black.

"In the Song Dynasty, the building lamp should be fired into markings and glaze color, and the iron in the tire and glaze must be involved together, and if the carcass has low iron content, it will be difficult to burn high-quality products. Modern improved building lamps mostly add some iron oxide to the glaze water to achieve another balance, and can also burn beautiful markings. The iron content of the local raw materials in Jianyang Shuiji is very high, so the cups burned by local masters basically do not have the problem of pseudo-iron tires. The markings of Jianzhan belong to the iron crystalline glaze, which requires high temperature and reduction procedures. Not all kiln glazes are iron crystalline glazes, such as Jun kilns, which are opaque glazes with copper as the coloring agent.

"There is also the appearance of the fetus, which is a common feature of Jianzhan, but it is not absolute. In the Song Dynasty, because of the flow of glaze water, the whole glaze was included, and most of the building lamps would deliberately expose a part that was not glazed.

"Modern technology can burn a full glaze pot, and a full glaze pot, it is very difficult to do a non-stick kiln, you must find a suitable position in the kiln space, put a few building pots, accurately control the temperature, holding time, reduction dose and frequency, the stop position of the glaze, the consistency of the glaze, and the time to stay in the glaze barrel, there are many factors that affect the finished product, and it can be fired into that are treasures."

Lan Eucalyptus admired it, and only then did he know that there was so much knowledge in the firing of Jianzhan. Take a look at the latest chapters of "Dream Claw Book House in the Great Era" and read it for free for the first time.