In this tutorial, I show you how to make royal icing for your bath bombs I do include my recipe with optional additives It s really easy so give it a go Royal Icing Recipe 1, 2 Cup of Cold Water 1, 4 Cup of Meringue Powder 1, 2 Teaspoon of Cream of Tartar 4 1, 2 Cups of Powdered Sugar (at least Have 6 on hand )