Pour 1/4 cup of rubbing alcohol into a zip lock bag and add about 10 drops of food coloring. Close the bag and shake it well to mix the ingredients.
Open the bag and add 2 cups of pasta. Close the bag and shake it vigorously to distribute the color onto the macaroni.
Lay the bag flat on a table or counter top for about two or three hours for a deep, bold color. For lighter colors spread the macaroni out on a some waxed paper and allow it to dry overnight. Drain the alcohol into the sink before spreading the macaroni out.