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Copper does not rust. It can however be eaten by low PH water and Chlorine.
tap water will rust it faster. tap water lets more oxygen get to the nail and should cause it to rust in a few hours after being put in the water
The nails need to be left in the water for quite a time. The particles of rust will dissolve into the water particles. Gross, but you can.
don't put water in a tank
it would rust
Put in Hot water
If you put metal in water it turns rusty basically any condition is possible for rust. All rust needs is oxegen, and that is in the air and also in water
you put it in water for a day or so and then you scratch it
Put it in Salt Water then, let it out to dry. After that, you repeat it a couple of times.
the wool does not rust
Firstly, put metal into water. When these two chemicals engage, the watery metal get's exposed to oxygin which produces rust. So all you need for this is metal and water!