It's only when the wood gets wet (from rain, dew, or poor handling of the hose) that tannins convert into tannic acid. If you've used ferrous or steel nails, the acid reacts with the iron ...
In this experiment, one iron nail is wrapped in magnesium, another in copper and one left alone. The nail wrapped in magnesium is not corroded. There is slight corrosion on the normal nail and ...
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