Introduction of gold thread
Gold wire, also known as "eel blood", is a major feature of Ge Kiln. Because of the different expansion coefficients of porcelain embryo and glaze, the glaze layer shrinks greatly when it cools after firing, and there will be natural cracking on porcelain glaze? Its stripes are interwoven like a net and broken like ice. After that, ink was used as a coloring agent, which artificially infiltrated into the cracks, and the color was very dark after coloring, forming gold wires and iron wires. Gold wire and iron wire are colored glass wires composed of bubbles, glass and cracks.
Introduction to the cause of formation of gold wire
The cause of the gold thread of Ge kiln wares in Song Dynasty has been wandering in the misunderstanding since ancient times, and the overall fault lies in the dyeing theory. However, many people think that the formation of gold wire should be formed by secondary reburning and tertiary baking. It is the secondary reburning that makes the free iron molecules in the tire material reduce to light red (that is, gold wire) after the secondary reburning and cracking. However, the cracked iron wire during the second burning is the black substance of the fetal bone itself (Zijin fetal quality). You know, both gold wire and iron wire must be related to the overflow and compatibility of wax juice and jade liquid during browning. The fetal quality of Song Dynasty is black and purple soil. After the first firing, the main line appears after the second re-firing. The third baking should be carried out at a lower temperature and for a longer time, so that the free iron molecules in the fetal mass gradually gather, reducing the hair color and showing a reddish color. This red silk texture is made up of less aggregation. Against the background of the black tire width crack line, the reddish silk pattern gives people a visual golden color, so it is called gold thread. As for the change of the texture of Geyaokou, it should be related to the manufacturing process during firing, but the cause of the main gold wire is that the second firing is related to the third firing.
Introduction to the cause of formation of gold wire II
It is generally believed that the color of "golden thread" in Song Ge kiln is not only due to the success of the ancients in the selection of tire soil, ingredients, processing and research and development of glaze formula, but also due to the special temperature control skills mastered in the firing process of porcelain. For example, when the overall temperature of porcelain in the kiln decreases after firing, the glaze fission can appear large reticulate phenomenon, and then the residual temperature will promote the second shallow striation fission of glaze. If the kiln temperature is allowed to cool naturally, the finished product will have gold wire and iron wire when it comes out of the kiln. Coloring principle of gold wire and iron wire. Fission occurs earlier in large grid lines and later in small grid lines. The degree and time of oxidation or incubation of the fission line in the kiln are different, and the color of cracks in the line is also different. It is considered that the gold wire of Song Ge Kiln was naturally formed before the utensils came out of the kiln, and its coloring was not dyed after coming out of the kiln, but a masterpiece of the ancients in one go.
It can be seen that the gold wire of Ge kiln in Song Dynasty existed when it was fired in the kiln. It is believed that the cause of the gold wire is that everyone who dyed it later is wrong. Moreover, it is difficult to copy the gold wire and iron wire on porcelain now. This is because the formation of gold wire and iron wire requires special firing skills. Here, Bian Xiao, Tuba Rabbit, said that it is enough for everyone to know the origin of gold silk, which can be used as a supplement to porcelain knowledge and can also be used as an identification of antiques to judge whether it is genuine or not.
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