Veganbaking.net - The Hows and Whys of Vegan Baking
Veganbaking.net - The Hows and Whys of Vegan Baking
  
Does your chocolate have a white powder on it? Put the anthrax medication away and rest easy. The white chalky substance on your chocolate is called 'bloom' and it's just the cocoa butter rising out of the chocolate. It will go away completely and melt back into the choclate as soon as it's re-melted and flavor and texture won't be affected.