Fondant icing creates a smooth surface on cakes and cupcakes that you can use as a canvas to display your own designs and messages. While liquid food colouring might seem like an obvious paint supply for this project, the water in the food colouring can make the fondant soggy and detract from your cake's appearance. Instead of using water-based food colouring, look for gel and paste food colouring, and thin them to the proper paint consistency with alcohol-based flavour extracts.
Measure 1/4 tsp of paste or gel food colouring into a small bowl.
Add approximately 1/8 tsp of clear vanilla extract to the bowl.
Stir the food colouring and vanilla extract together until the mixture has a uniform consistency.
Dip a clean paintbrush into the food colouring mixture and use it to paint directly on a fondant covered cake or cupcakes.
If your mixture is too runny, you can thicken it by adding more food colouring. Thin the mixture by adding more clear vanilla extract. You can use other flavour extracts such as almond, orange or coconut instead of vanilla extract.
Avoid using tinted flavour extracts because they might change the colour of your food colouring.