Shining Pennies

Here are a few photos from our latest chemistry experiment in Kindergarten.  Is there any way to clean a penny once it gets dull over time?  That's the question that the Kindergarten students set out to answer last week.  We tried four different solutions to see if we could bring a shine back to our pennies.  Three of our solutions didn't work, but it was exciting when our last combination of vinegar, water and salt worked and made our pennies look new again!  Take a look on the experiment page of my blog if you'd like the recipe.  I'll post it there so you can try it at home.