If you are concerned about food colorings try natural food coloring in your cake decorating.
How to Make Natural Food Coloring - Mary's Nest
How to make natural food coloring
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How to Make Natural Food Coloring for Christmas Baking
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Homemade red food coloring
Natural Orange Food Coloring - .5oz – Nature's Baker
Natural Red Food Coloring - The Plant Based Palette
Natural Vegan Food Coloring for Frosting - Crowded Kitchen
Natural Food Coloring for Frosting - The Spunky Coconut