Melt chocolate gently for best results. If chocolate gets too hot, it may not set properly and will develop "bloom" (white streaks) on the surface when stored. Stirring chopped chocolate in a pan or bowl over hot, not simmering, water maintains an even, low temperature, resulting in glossy, firmly set chocolate. The setting time for the bark varies greatly according to the temperature of your home. Although we preferred the texture of the bark set at room temperature, you can set bark in the refrigerator if necessary.