::CANDY CHEMISTRY::

A few nifty facts as we embark on trick-or-treating this year:

The Ms on M&Ms are made of titanium oxide.

Food dyes designated as "lake colors," such as "FD&C YELLOW 5 LAKE" in Skittles, are, ironically, insoluble in water.

The eyes of Peeps marshmallow candies do not dissolve in hydrochloric acid.