For painting gumpaste (fondant) it is best to use vodka instead of water to dilute the food colouring. Water makes the gum paste soggy and sticky and the colour does not show up as vibrantly. I pour the vodka into a little dish and dip my brush in it when I want to dilute my colours.
Learn how to make the most amazing Gum Paste recipe from the incredible Nicholas Lodge. Make beautiful and realistic sugar flowers with ease! Visit the following link to get the full instructions, vid (Chocolate Fondant Link)