Colour Mill Oil Based Colour 20ml - WHITE (1 ratings) Whitener that actually works! £4.50 We're more than happy to let you know when we expect more stock. Please email us. Just like the colours, the Colour Mill White will dye both the sugar AND the butter/oils in your baking. When you have a colour with the ability to dye and disperse throught every ingredient, you're guaranteed the best result.