Notes for Attention

Matters needing attention Why does copper turn black? How to clean blackened oxidized copper? Because copper ions are extremely unstable. So copper is easily oxidized (blackened) and produces patina (green or blue powder). The purest copper oxidation blackening faster, copper oxide is non-toxic, does not affect the use and function, if the copper occurs oxidation blackening. You don't need to worry, you can soak it with vinegar and salt, and then wipe it with a steel ball and detergent to regain a bright luster. If you do not maintain properly or do not use patina for a long time. It is recommended that you sand the patina off, so that it can be used normally.