[ After 9 hours elapsed ] The bamboo salt solution turned black due to the rust coming off of the nail . On the other hand , the nails in the solar salt and refined salt solutions began to rust in yellow .
[ After 1 day ] In the bamboo salt solution , the nail ’ s rust came off and the water turned clear again , so the number and scales on the other side of the beaker could be seen . In the solar salt solution , some rust from the nail came off and the water turned yellow . In the refined salt solution , the nail continued to rust and no change was observed .
[ After 2 days ] The bamboo salt solution did show big changes , and the solar salt and refined salt solution showed continuing oxidation .
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