Stained ancient jade repair knowledge

“How do you deal with the jade that you bought back from the antiques market? How to maintain the jade for a long time?” These problems often plague collectors. Jia Wenzhong, a famous cultural relics expert in China, told everyone that when the jade in your hand has a "problem", you don't have to go to the experts to help. As long as you master certain techniques, you can learn to deal with it.

Jia Wenzhong said that in order to master the repairing skills of jade, it is necessary to first understand what kinds of jade materials are available, according to the jade material and color "the right medicine." For a long time, people used to divide jade into "soft jade" and "hard jade" by hardness. The soft jade has a hardness of 6 to 6.5, the main component is calcium silicate and fiber minerals, and the color is close to the fat of the grease. The pure color is white, delicate and moist. Some nephrites contain a small amount of oxidized metal ions, and exhibit a color such as cyan, green, black, and yellow.

The hardness of jadeite is above 6.75 Mohs. The composition is mainly composed of sodium silicate and aluminum silicate. It has a vague crystalline structure with a hard texture and a glass luster.

It should be noted that most of the ancient Chinese jade articles are made of nephrite, especially Xinjiang Hetian jade, which is an important source of ancient Chinese jade materials.

In the market to buy back the ancient jade with soil, the first thing to clean the surface dirt, water and alcohol can be used for cleaning, if the oil can be used to decontaminate acetone or thinner. The cleaning tool generally uses a brush such as a toothbrush, and the dirt can be removed by using a bamboo repairer. If it cannot be removed, diluted hydrochloric acid, formic acid, etc. can be used, and an ultrasonic cleaning machine can also be used. Alternatively, a partial ironing method may be employed to dehydrate or partially peel off the rust.

For the broken jade small pieces, you can use 502 glue to bond, you must pay attention to the tight joints when bonding, and then tie them with a wire to make it have a certain pressure, so that the bonded objects can be firm. The glue flowing out after bonding should be wiped off with acetone solution.

If it is a broken jade, you need to first use gypsum to engrave the same pattern as the original. After the plaster mold is completed, remove the gypsum carving type, mix the resin according to the color, pour it into the mold, and then remove the outer mold after drying. The appearance of the object close to the original can also be repaired with color, and finally the invisible traces shall prevail. Jia Wenzhong said that at present, hospital dental has an imported dental filling resin. When the jade is repaired, the effect of repairing is basically the same as the original.

As long as you carefully study and summarize, these jade problems can be solved easily and by yourself.