Place all the ingredients in the bowl of an electric mixer and beat slowly until they are blended. Then beat at medium speed until icing forms stiff peaks, about 5 minutes. Add more sugar if the icing is not stiff enough or a few drops of water if it is too stiff. Use immediately or cover the bowl with a damp cloth to prevent drying when not in use. Allow at least 24 hours for royal icing decorations to dry at room temperature.
Ingredients
5 tablespoons meringue powder (found in cake decorating stores)
1/2 cup minus 2 tablespoons water
or
2 egg whites , at room temperature
1/2 teaspoon cream of tartar
2 teaspoons water
1 pound confectioners'