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tin is a kind of metal with lower melting point and stong plasticity . its value ranges fourth after platinum, gold and silver . it has the featurees of disnfection , without porson, ani-oxidation and fine luster . adhering to the readitional technology which contans more than 97%of tin and mord than 10 trace elements which do good to people's health . the pure tin products that are preserving . the color and flavor of tea or chinese medicine are lasting after they have been stored for a long time .