Colour Mill - Blue Bell 20 mL Oil-based colouring for icing. Experience the vibrant world of Colour Mill Oil Blend Colors, the perfect choice for adding a burst of rich, intense color to your culinary creations. The oil-based pigments are packed to the brim with butter-loving pigment and are ready to seamlessly mix, mingle and be topped with sprinkles. Free from fillers and gums, the fade resistant formula is here to brighten up your baking and give your occasions the colour they deserve.