Apple Wax
Apples are coated with shellac and carnauba wax to improve their shine because consumers prefer to buy shiny apples.
This seems dumb, but it's true!
These coatings are not harmful, but you should always rinse your apples with soap and water or with vinegar before you eat them.
This is a good link…
http://www.bestapples.com/apple-info/facts/wax.asp