Silver dials are then rhodium or even fine silver to prevent tarnishing.
银色表盘铑甚至是精细的银,以防止变色。
Old man asks merchant to read a letter, in the letter write finally: "Have fine silver additionally 10 2, make living cost to father. ""
老翁请店主读信,信中最后写道:“另有纹银10两,给父亲做生活费。”
Using ascorbic acid as reducing agent and gelatin as dispersant, the spherical ultra-fine silver powder was synthesized by the chemical reduction method.
采用化学还原法,以抗坏血酸为还原剂,明胶为分散剂制备了球形超细银粉。
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