Jade dyeing process can be divided into two categories:
1, inorganic dyeing, also known as metal ion penetration dyeing, is colored by soaking and baking metal in water-soluble inorganic salt solution.
2. Organic dyeing is just like the textile dyeing process. The first process is the most commonly used. Dyeing jade is harmless and safe.
Dyeing, also known as "baking", is a method to simulate the natural skin color of jade by using artificial imitation technology of dyes on jade with no color or poor color.
The method of differential dyeing is:
(1) Edge jade: It looks like jade and stone, with different colors, and the color distribution is like ancient jade and aged jade. This kind of jade is actually the edge jade (edge stone) at the junction of jade mine and rock, and its color is different from that of ancient jade. In the original state, the process of rock metamorphism and metasomatism is incomplete, or foreign minerals are formed after melting, and their color position, divergence, boundary and surface of utensils are obviously different from Qin color. This situation also exists in the jade with the secondary color of Tianxiong when it is weathered.
(2) Skin color: The formation of skin color is different from that of jade. It is a natural secondary color formed by jade in nature, and the colors are black, red, yellow and chestnut. When many jade workers make jade works of art, some deliberately leave skin color as "pretty color", while others leave some skin color to show that it is authentic seed material (seed material is better than mountain material, and mountain material has no skin color). It is precisely because the skin color is the remains of weathered skin that we can see that its color is from the outside to the inside, leaving a loose weathered jade on the skin shell, which is not as dense, shiny, oily and watery as the jade body, and often has pits and is not smooth.
(3) Coloring: Artificial coloring belongs to the artificial secondary color of jade, which is also an artistic process of jade and is also used by counterfeiters to make fakes. Artificial coloring began in the Song Dynasty. Before the Ming Dynasty, the jargon of artificial coloring was called "old oil pressing", and later it was called "new oil pressing". Perhaps people realize that the color of jade carving art belt will be more beautiful from the pretty colors, so they think of artificial coloring. Oil extraction coloring is different from Qin color. Although the coloring starts from the skin shell and penetrates into the jade muscle along the cracks and weak jade, the color is dim. The piano color of ancient jade is produced in a hundred years of drying, and it is very natural to extend, diverge and dip. Coloring is a short-term behavior, and the two cannot be exactly the same. Many unearthed old oils have faded and fallen off in the leather shell and become mottled. On the contrary, it is not as heavy as the color extending into the jade muscle. This phenomenon is absolutely untenable.