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Place milk and pudding mix in a bowl and whisk for about 2 minutes.
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Divide pudding into three different bowls. Add red food coloring to one (about 10 drops) and blue food coloring to the other (about 10 drops) leaving the third bowl of pudding un-colored. Mix until color is consistent throughout.
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Place three sandwich size ziploc bags in glasses, folding the edge of the bag over the edge of the cup.
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Pour each pudding color into a different bag and zip shut.
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Cut one corner off of each bag and fill popsicle molds with the pudding. I layered red first, then white, then blue.
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Place popsicle sticks into the molds and allow to freeze for several hours until fully frozen.