Why is it called B goods? The English word bathe first letter is B. Therefore, the washed jade is collectively referred to as “B goods” and “bleached goods”. The flushing of jade is of course not water, but it is soaked with strong acid, corroding and dissolving impurities and stains to make it clear and transparent. The jadeite structure washed with strong acid is loose and must be filled with cracks after acid etching. The common method is to inject transparent resin by vacuum negative pressure method. The refractive index of this resin is close to jade. After polishing, it is almost no different from high-grade jade. However, the color of the Jade B goods is obviously not as natural and pure as the color of the A jadeite. This article is to make a reference to the production and processing of Jade B goods to everyone, so that everyone has a reference when purchasing jade!
The production method of jade B goods has always been kept secret for the jade merchants who make the fake products. In the book "The Complete Works of Jadeite" by the famous jade expert Professor Ouyang Qiumei, the production of jade B goods is described in detail. The summary is as follows:
Sample selection: The color is acceptable, the texture is not too dense, and the jadeite with pollutants is prepared. Choosing jadeite with less texture is to make the acid easily penetrate into the jadeite to dissolve impurities; in addition, black black sand jade is often polluted by secondary black matter, so that the original green is not prominent or dark, The effect after treatment is better; the flower green and bean jade raw materials are treated well.
Cleaning the grease: The sample is placed in clean water for 2 hours to remove the oil and grease left by the jade during the processing of the slice.
Immersion acid to remove dirt: The sample is placed in a mixed acid consisting of concentrated hydrochloric acid and concentrated nitric acid, and the container is placed in an oven and heated to 80 ° C for 20 days (the structure is relatively loose "eight three jade" only 15 d), Remove yellow and dirty spots from the sample cracks or pores. If the soaking time is too long, the strong acid may chemically react with the chromium in the jadeite grain, making the "color root" boundary unclear.
Wash the sample: Wash off the residual acid and reactants in the sample with water.
Soaking and neutralizing in alkali: soaking the cleaned jade into the alkali solution for about one month. In addition to neutralizing the residual acid, the alkali will chemically react with the sodium pyroxene in the gap between the jadeite particles to make the jadeite structure loose. . At this time, the jade is in a clean and loose state, creating conditions for filling.
Wash the base with water: Cook the sample in clean water several times until there is no alkali, then dry for use.
Vacuum filling epoxy resin: The sample is placed in a sealed container and the vacuum is first drawn, the air in the crack is extracted, and then the epoxy resin is filled into the loose crack of the emerald. Then inflate and pressurize the container to ensure perfect filling in the crack. After taking out, it was kept in an incubator at 100 ° C for 8 h to complete all operations.
The common Jade B cargo handling has the following nine steps:
The first step is to select the material. The first requirement is that the graininess is obvious. Otherwise, the strong acid is difficult to invade. The second requirement is of course that the material grade is low. It must be that the value before B is much lower than that of B, which is generally dirty. Features.
The second step is to open the film. The thickness of the film is the thickest and cannot be thicker than the thickness of the bracelet. Because it is more than 1 cm, the acid is often difficult to soak, and the time is equal to the increase of cost! !
The third step is to wash with strong acid, usually with concentrated nitric acid or concentrated hydrochloric acid, because the volatility and salt of these two acids are easy to rinse. It is heated when necessary.
The fourth step, neutralization of strong alkali, its role is self-evident.
The fifth step is to further neutralize the cleaning, generally with weak acid and weak base, and finally rinse with water.
The sixth step, drying, finished, if you want to do Fu Lushou, or deceptive yellow, or simply B+C, put the corresponding dye in the corresponding position, this step of the product is like chalk, Therefore, the sorption of the dye is very good. Is it not good to suck the chalk in the ink?
In the seventh step, the dry material is evacuated and ready for injection.
In the eighth step, the heated melted glue is placed in a vacuum pump containing dry materials, and the negative pressure is slowly reduced, and the glue is pressed into the dry material by atmospheric pressure.
The ninth step, cooling the raw materials, carving and processing.