Tint frosting orange with icing color and heat 25 to 40 seconds in the microwave, until it's the consistency of heavy cream and thin enough to pour. Place 6 doughnuts on a cooling rack over wax paper. Evenly pour frosting over doughnuts to completely cover. Let cool 10 minutes, then transfer to a plate, using a spatula. Scoop icing from wax paper, reheat, and pour over remaining doughnuts to coat.
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