Science Project

Can rusty pennies become shiny? By: Aaron Johnson


If the right amount of salt is added with vinegar, I believe then the penny will become shinier.


  • Salt
  • Vinegar
  • 3 Cups
  • 3 pennies
  • Napkin
  • Measuring cup

The Controlled Experiment

I created a controlled experiment by placing each penny in a cup half full with vinegar and different amounts of salt. Cups 1-3 (Left to right) all had different amounts of salt. Cup 1 had 80 mL, Cup 2 had 40 mL, and cup 3 had 10 mL.

Drawing My Conclusion

My conclusion is that the more salt, the more shinier the penny will be. Although lesser amounts were poured into the other cups, the pictures still proved that salt is an important factor when cleaning pennies because they were still cleaned a little bit.