Copper Oxidation
what you need
.salt
.water
.copper coins
.cup
.tin
1.pour some water in a cup.
2.mix 2 tsp of salt to the solution.
3.ad 3 copper coins to the salt water wait for a 2 months.
sodium chloride
what you need
.salt
.water
.container/lid
1.pour some water into the container.
2.mix 2 tsp of salt in to the solution
3.put the lid on the container.
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