如果你发现金属开始呈现蓝色、灰色或黑色，这是氧化的迹象和生锈的先兆。
If you find the metal has a blue, grey or black color, it is a sign of oxidation and a precursor of rust.
它没有生锈的户外暴露承受和抵御高温氧化高达1400华氏度。
It withstands outdoor exposure without rusting and resists oxidation at an elevated temperature up to 1400 Degrees Fahrenheit.
而酸，比如可乐中的弱酸，和氧化物产生化学反应，能有效避免生锈。
Acids, like the weak acid present in your can of Coke, can react with oxides to effectively reverse the process of tarnishing.
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