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珍珠是名贵的动物性中药材和精美的装饰品 ,不同等级珍珠的经济价值相差很大。有效降低珍珠的次品率是提高收益的重要保证 ,现将次品珍珠的产生原因及其防止对策介绍如下。1 污珠 珠面光滑 ,但珠心含有泥沙、污物。从外观看 ,珠质发黑 ,色深而杂。主要成因 由于工具不净、用
Pearl is a precious animal Chinese herbal medicines and exquisite decorations, different grades of pearls vary greatly in the economic value. Effectively reduce the defective rate of pearls is an important guarantee to increase profits, now the causes of pearls and countermeasures to prevent them are described below. 1 Pearl bead surface smooth, but the bead contains sediment, dirt. From the outside, the nails are black and dark in color. The main reason due to the tool is not net, with