>>11075466>https://en.wikipedia.org/wiki/Sterling_silver>Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925.>Fine silver, for example 99.9% pure silver, is relatively soft, so silver is usually alloyed with copper to increase its hardness and strength. Sterling silver is prone to tarnishing,[1][2] and elements other than copper can be used in alloys to reduce tarnishing, as well as casting porosity and firescale. Such elements include germanium, zinc, platinum, silicon, and boron.Copper and zinc are soluble in nitric acid at room temperature, germanium and boron only in hot, concentrated nitric acid, platinum needs additional chloride or hydrochloric acid in order to dissolve and Silicon requires fluoride or hydrofluoric acid because the resulting SiO2 is insoluble otherwise.
Do NOT work with acidic fluoride solutions in glas vessels and AVOID skin contact!
