When flouring a cake pan, take into consideration the flavor of the cake. If you plan to serve the cake dusted with powdered sugar, a white ring on the side of a chocolate cake takes away from the appeal. For light cakes, use white flour to flour your pans. When making a dark cake, use powdered cocoa. The cocoa works in the same manner as the flour with regard to release and it doesn't leave a white ring around the edge or on top of the cake.