Tannic nature: one with strong polarity, soluble in water, ethanol, acetone and ethyl acetate; the second is with heavy metal salts (such as lead acetate, copper) and alkaline earth metal hydroxides [such as Ca (OH). ] Solution to form a precipitate; the third is the formation of complexes with transition metal color Xianyang wooden showcase, such as reaction wood showcase with FeCl3, born black or green precipitate; fourth is a strong reducing agent shenmu wooden showcase, easily oxidized in air, especially in the Under the action of the enzyme to form a color compound. Toothpaste cleaning method the surface of white paint showcase Tongchuan wooden showcase, a long day will be yellow, not only looks old old, and feeling very fresh. You can with a rag dipped in toothpaste or tooth powder gently deposited on top, use toothpaste bleaching, display cabinets paint color can turn from yellow to white. But wipe avoid friction force, because of the friction agent in toothpaste, tooth powder paint will wear off, the surface will damage Yulin wooden display cabinet showcase | Shaanxi Boha Showcase (certified) | Wooden Showcase by Shaanxi Boha Showcase Productions Ltd. . Shaanxi Boha Showcase Productions Ltd (www.xabhzg.com/) is Xi'an, exhibition equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Shaanxi Boha showcase leadership with the staff warmly welcome all inquiries negotiations to create Shaanxi Boha showcase a better future.