PTI Food Color Grey is used to make food more attractive, appealing, appetizing, and informative. Perfect to add color to the buttercream, sugar paste, royal icing, or cake mixes. Strong vibrant color. Gluten-free & alcohol-free. Using black and blue food coloring is a popular choice amongst food experts for making gray food coloring. Add the blue to the black with white icing gives you more control over the shade of gray. These highly concentrated soft gel food colors are formulated with the necessary die concentration levels needed to achieve the most vibrant and brilliant shades of gray. Provide color to colorless and "fun" foods.