You just blew my mind. This is a new tip for me. The rainbow is effect is so cool- especially with the blending of secondary colors where the primaries meet. But the possibilities are endless. How about a tonal blend of frostings? Dark blue, medium blue, light blue for a boy-themed baby shower? Medium green and light green for two tones for St. Patrick's Day? I assume you could do this for colorful meringue cookies? I must color all the piped things now!!!

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