Why silver chocolate wrappers are used?

Often you might have found that chocolates are wrapped in foils.The foils may be of aluminium,silver and so on.These wrappers are used because-
*They are very thin and get easily fitted around the chocolate.
*The cost is vey low.
*They act as a barrier for moisture.
*They maintain the standard and quality of  the product.
*They keep the product fresh and clean.

                                                                 Tarbej Ansari