24 February 2011
The other day Sunnyboy was counting his money (by counting the number of coins in his moneybox) and showed me an old and dirty penny. We decided to clean some of the coins. We'd used up all the vinegar in the house last week making volcanoes, so for this we used lemon juice and salt. We mixed one tablespoon of lemon juice with one teaspoon of salt in a little jar. We put some coins in and left them to soak. Later we took them out and polished them with a cloth. When we have some more vinegar we'll try it with vinegar and salt, and we'll also try it with coca-cola.
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