Perfect to add color to the buttercream, sugar paste, royal icing, or cake mixes. Strong vibrant color. Gluten-free & alcohol-free. To make basic purple, add in 15 drops of blue food coloring with 80 drops of red food coloring. Mix to combine, then use as required. The color purple has a variety of effects on the mind and body, including uplifting spirits, calming the mind and nerves, enhancing the sacred, creating feelings of spirituality, increasing nurturing tendencies and sensitivity, and encouraging imagination and creativity. PTI Food Color Purple provides color to colorless and "fun" foods.