Sugarflair Superwhite Whitening Powder 20g grams - Superwhite by leading manufacturer . It is a fantastic product that can be used to whiten buttercream for cakes and cupcakes. You can also use alcohol or sugarflair rejuvenator liquid to turn this powder into an edible white paint to paint directly on your cake, or add a little to your lustres or blossom tints to lighten the colour.