to Make Gray. 2. Drop the involved colors into white icing. Spoon the needed amount of white frosting into a glass bowl. Gradually add the involved colors and mix until fully combined. read more
Liquid Food Coloring. Liquid food coloring -- sold at grocery stores -- is inexpensive and simple to use, but it comes in just a few colors. You may not be able to make a true gray with this type of food coloring, but for a close approximation, mix 5 drops of blue, 3 drops of red and 2 drops of yellow into 1 cup of frosting. read more
Gradually add the involved colors and mix until fully combined. As a reminder, the color options are: Black and white (note: you do not need to add white food coloring since the icing itself is white) Blue and orange; Yellow and purple; Red and green; Red, yellow, and blue; Add liquid food coloring by dropping it in with the bottle's dropper cap. read more