How To Make Purple Food Coloring Without Blue. (baking soda will affect the flavor of the coloring, so use as little as possible to reach the desired color.) Add 1/4 cup washed fresh (or thawed) blueberries with 2.
Another good way to measure the drops needed is by thinking that 100 drops of food coloring is equal to about 1 teaspoon. As purple is secondary color, the primary colors red and blue make purple when mixed together.
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Blue and red are essential to creating purple, but you can mix in other colors to create different shades of purple. Blue will probably be impossible.