Rainbow Dust Purple ProGel Food Colouring 25gProGel by Rainbow Dust Color is a ready to use, professional grade, concentrated food color. The smallest amount of gel can be mixed with sugarpaste, icing, buttercream, marzipan etc, to achieve your desired shade of color. Presented in a compact, easy to use tube that allows clean handling and storage of the colored gel. Presented in a compact, easy to use tube that allows clean handling and storage of the colored gel. Ingredients Glycerine, Silicon