The raw materials for producing grade B jade are generally coarse-grained particles with loose structure, such as bean seeds, dry white land and oil green seeds, which are beneficial to rinsing and filling. Soaking jadeite raw materials in concentrated hydrochloric acid or sulfuric acid to decolorize and destroy the structure of jadeite; Then neutralizing the remaining acid with weak base; After this treatment, jadeite is often slag-like, and can even be crushed by hand. At this time, it is necessary to fill the gap with resin glue to reinforce it.
To understand a commodity, we should start with density. That is to say, after each piece of jade is sold, its density should be measured first, and attention should be paid to anything less than 3.33. (The reason is simple. Although the density of jadeite is defined as 3.25-3.43, jadeite with low density will not be very good even if it is A, while jadeite with density above 3.33 may be B or below. Because not all jadeites are suitable for B goods. B There are cracks and pits evenly distributed on the surface of jadeite jade, which is also called acid etching reticulate pattern, which is caused by the different expansion and contraction coefficients of jadeite crystal and filler.
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