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).
Colour Mill Oil Blend Food Colouring Rust: Next Generation Oil Based Food Colours - 100 ml
The Baked Studio Colour Mill Oil Based Food Colouring Sets - Coffee Latte Sand Clay Rust Burgundy - Buttercream Fondant Sugarpaste Icing and Chocolate Colour (Outback), 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
Colour Mill Oil Based Food Colouring Pool Party Set/6 - Next Generation Oil Based Food Colouring for Baking, Decorating, Icing and Cooking Food Dye DIY Slime and Crafts Making Burgundy - 6 x 20 ml