To evaluate bloodstone, we should first look at the red color of "blood", and its freshness, coagulation and thickness are better. Fresh people are as red as dripping blood; Coagulators gather but do not disperse; Thick refers to those with thickness and layers that penetrate deep into the stone layer. In addition, the spread of bloodstone is also an important basis for judging bloodstone. The ground is what kind of stone red is dyed on. The ground of bloodstone is pure, translucent, and the bright red color of blood without nails is the top grade. The samples of bloodstone can be divided into square, rectangle, ellipse, circle and deformity, and the size is about 5-2 cm.
Bloodstone is delicate in texture, tough and compact in structure, and will not collapse when being cut.
Good bloodstone is not carved, and it is best to make a seal. It can be said that all carved chicken blood is generally used to cover up its defects, which is not expensive.
Due to the high quality and price of bloodstone, there are many counterfeiters. The fake methods of bloodstone are generally as follows:
(l) mosaic method. Take a Chang fossil seal with good texture, select several striking places, dig out small pits with different depths respectively, then embed it with red fluidized mercury paint, and then polish and wax it after it is naturally dried in the shade. However, this kind of embedded chicken blood (mercury sulfide) has no layers, and at the same time, the junction of blood and fossil is hard and has no transition.
(2) Immersion method. Take a square fossil, coat it with mercury sulfide where necessary, dry it in the shade again, then dry it in the shade to make its blood slightly layered, then soak it in transparent resin, make sure that the whole body is soaked, pick it up and dry it, and then polish it with fine water and sand. The fake bloodstone made by this method, because the resin is easy to age, the skin will turn yellow over time, which is out of harmony with the internal stone color; At the same time, the pores of the resin epidermis are relatively thick. Careful observation with a magnifying glass shows that there are a little tiny scratches on its surface.
(3) Slice and skin sticking method. Cut the six planes of the stone seal into six sides as thin as paper with a cutting machine. Apply mercury sulfide where needed. After being dried, stick the original six slices back by blanching and glue, and then polish the corner between the slices and the glue. In this way, the red color of chicken blood seems to be born in the stone chapter and naturally distributed. But the level of blood can only stay on one plane after all. This kind of stone seal can only be limited to square or rectangular stone seals, and nothing else can do. Because the round and deformed stone seal can't be cut and carved, the trace of hot sticking of the thin sheet is exposed.
(4) Supplement method. This is made by adding mercury sulfide to the real bloodstone, covering the added part with a very thin layer of resin and polishing it. This kind of method is to add blood to blood, which is undoubtedly icing on the cake and greatly increases its value. At the same time, there is falsehood in truth and falsehood in truth. Therefore, for the particularly good bloodstone, we must pay attention to and associate it with the counterfeiter's technique when observing, so as to avoid the consequences of "careless loss of Jingzhou".
In the 1970s, bloodstone was also found in Chifeng, Inner Mongolia. However, it is not as delicate and tough as Changhua bloodstone, and the water content in the stone is high, which is easy to crack in drought. The distribution of blood is mostly in the shape of blood tendons, criss-crossing, scattered but not aggregated, and easily oxidized and darkened. Inner Mongolia bloodstone is the same species of Changhua bloodstone, but its value is far from the same.