The Creation of Yao Bian Jian in Song Dynasty

Made of 1 iron tire and sintered at high temperature.

Someone once said that obsidian was not the product of kiln firing, because the kiln site had not been excavated at that time. In fact, according to the analysis of fetal bone characteristics, it can be judged that obsidian is unlikely to come from other kiln mouths.

Later, through archaeological and expert research, it was identified that the obsidian lamps currently collected in Japan really came from building kilns. Therefore, the obsidian substation is the building lamp burned in the kiln first, and then the obsidian substation lamp. Therefore, obsidian substation needs to meet the unique tire soil and mud in Jianyang, and it needs to be fired at a high temperature of 1300 degrees. If someone takes low-temperature colored porcelain as obsidian in the future, it can be exposed directly.

Glazing once, firing once.

The ranking of Jianzhan's development into black glazed porcelain is mostly attributed to iron-based crystalline glaze, which can form different stripes under high temperature kiln transformation. Rabbit's lamp and oil drop lamp are masterpieces of iron, and so are obsidian's lamps.

Glazing once and firing once is the most traditional way to build a lamp, which ensures the aesthetic feeling of the lamp to the greatest extent, and also accurately controls the soil and fire under the premise of the craftsman's reverence for nature, rather than changing the practice at will in pursuit of more beautiful glaze.

This is a principle to ensure the technical difficulty of lighting production and maintain the rarity of buildings.

3 spots are empty inside and dizzy outside.

Obsidian transformation has a very prominent feature-the spot is hollow, called "spot core". There are colored halos around the nucleus, which show different colors with different light and angles.

Spots and nuclei are similar to droplets in oil droplets, but the biggest difference between them is that the inside of oil droplets is colored and the outside is black. Obsidian changes just the opposite, with colors around it and spots without colors, which look like "hollow drops".

Compared with the uniform distribution of oil droplets, the distorted spots are in the traditional state of settlement and group. There is an aperture outside the water droplets, which are arranged randomly in groups of three or five drops, without fusion or deformation. The rounder the shape of the water droplets, the better. If the aperture around the nucleus is dazzling and there are colored spots in the rotation, it is the top grade. If the lights are different, the settlement situation is a little different.

Halo: There must be a colorful halo outside the locus, and it is not fixed, and it will emit different glows according to the angle. Take the existing three Obsidian lamps as an example, we can find that the spot nuclei are almost round and oval, there are halo blocks between the spot nuclei, and some filamentous pigments are randomly distributed.

To sum up, it can be concluded that not everything can be called obsidian change. Even the modern obsidian transformation cannot be classified as obsidian transformation if it does not meet the above conditions.