This is because all water-based materials have been removed and replaced with bake & cake friendly oils; these oils mix through much better than water-based gels (which we know water repels from the oils in your baking).
Edible Food Colouring Mill Emerald Oil Based 20ml Cake Decorating Sugarcraft
Colour Mill Oil Blend Food Colouring Emerald: Next Generation Oil Based Food Colours - 20 ml
Colour Mill Oil Blend Food Colouring Emerald: Next Generation Oil Based Food Colours - 100 ml
Colour Flex Oil Based Food Colouring Emerald - Concentrated Food Colouring for Colouring High Fat Foods; Buttercream, Chocolate, Sugar Paste, Fondant, Icing, Batter & More - 15ml
Emerald - Water Based Food Colouring 20ml
Colour Mill Oil Based Food Colouring Red - Next Generation Oil Based Food Colouring for Baking, Decorating, Icing and Cooking Food Dye DIY Slime and Crafts - 100 ml