FDA approved dyes are made with toxins such as coal, tar, and other petroleum based products.
You might wish to use natural dyes as listed here from science teacher Anne Marie Helmenstine, Ph.D.
Color - Ingredients
Lavender: Small Quantity of Purple Grape Juice, Violet Blossoms plus 2 tsp Lemon Juice, Red Zinger Tea
Violet Blue: Violet Blossoms, Small Quantity of Red Onions Skins (boiled), Hibiscus Tea, Red Wine
Blue: Canned Blueberries, Red Cabbage Leaves (boiled), Purple Grape Juice
Green: Spinach Leaves (boiled), Liquid Chlorophyll
Greenish Yellow: Yellow Delicious Apple Peels (boiled)
Yellow: Orange or Lemon Peels (boiled), Carrot Tops (boiled), Celery Seed (boiled), Ground Cumin (boiled), Ground Turmeric (boiled), Chamomile Tea, Green Tea
Golden Brown: Dill Seeds
Brown: Strong Coffee, Instant Coffee, Black Walnut Shells (boiled), Black Tea
Orange: Yellow Onion Skins (boiled), Cooked Carrots, Chili Powder, Paprika
Pink: Beets, Cranberries or Juice, Raspberries, Red Grape Juice, Juice from Pickled Beets
Red: Lots of Red Onions Skins (boiled), Canned Cherries with Juice, Pomegranate Juice, Raspberries