Why does chocolate turn white? It's not mold.

Popular Science 

Why does chocolate turn white? No need to worry--some molecules just moved around. The white splotches on these pieces of chocolate are known as'chocolate bloom.' Breakthroughs, discoveries, and DIY tips sent six days a week. A few years ago, a small baker from the West Coast had a problem. A day or so after baking chocolate chip cookies, the chocolate chips would develop an unpleasant white haze.