Neutral gray is the easiest to create when working with icing, but you can still make complementary and primary grays.  It's best to stick with neutral gray if you want a pure hue, but you can consider the other two types if you'd prefer a tinted gray. Since readily available packages of liquid food color come with red, yellow, green, and blue, you'll need to create primary (red, yellow, blue) gray or complementary (red and green) gray if you plan to use standard liquid food coloring. If you buy specialty gel or paste food coloring, however, you can create any of the three types since these food colorings have a wider variety of color options.
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