Cut off a little piece of fondant, about 1/4lb. Add 2 drops of Base Yellow, and 1 drop of Base Brown, kneading the colour thoroughly into the fondant. Work the small amount of fondant into the larger amount. Add more colour if needed. Knead fondant into a ball, and cut it in half. One kneaded and rolled out, cover both hamburger buns with fondant. Cover your buns with a coat of Ivory Icing Colour to give it a sheen.