Step 2 learn the ability to eliminate corrosion stains on the coins. When mixed into water soluble salt, soluble salts which have to be mixed with fruit juice in episode 1. 1 tbsp in the same coin, and that there is a stain in the soluble salt juice and leave for about 30 minutes, then observe the changes that occur.Take a coin out of clear water, dry thoroughly, compared with each other, and then save the results of an experiment that occurred.
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