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 Tiffany Oil Based 20ml Cake Decorating Sugarcraft
Colour Mill Oil Blend Food Colouring Tiffany: Next Generation Oil Based Food Colours - 100 ml
The Baked Studio Colour Mill Oil Based Food Colouring Gift Set - Tiffany Violet Fuchsia Hot Pink Cany Peach - Buttercream Fondant Sugarpaste Icing and Chocolate Colour (Fairytale), 120ml
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
Colour Mill Oil Based Red 20ml - Next Generation Oil Based Food Colouring for Baking, Decorating, Icing and Cooking Food Dye DIY Slime and Crafts 20ml
Oil Based Food Coloring for Chocolate - 7x10ml Vibrant Color Oil Based Food Colouring, Chocolate Colouring for Candy Melts, Buttercream, Frosting, Baking, Fondant, Cake - Fat Soluble Food Color Dye