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RAINBOW JELLO CUPS: 3 oz. box of each color jello (blue, yellow, and red), box of knox gelatin, and cups. Mix the blue jello with 1/2 an envelope of the knox gelatin. Pour in 1 cup of boiling water. Dissolve the gelatin. Add 1/2 cup of ice. Stir until thick. Remove any remaining ice cubes and any bubbles that may have formed. Pour into each cup, filling about 1/3 of the way. Let set in the refrigerator until firm. Repeat with the yellow and red jello.