PERFECT PURPLE. We looked and looked and finally found the perfect purple. What a gem!. It costs more than our other lovely colours but worth every purple penny!. – Lilly?s colours are concentrated water soluble and approved food colouring powder. Colour your icing, plastic icing, candy floss, ice cream. Lilly?s colours are simply beautiful and easy to use. – Every colour will give you a number of shades from light to darker as you add more of the powder.