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 Merlot: Next Generation Oil Based Food Colours - 20 ml
Colour Mill Oil Blend Food Colouring Merlot: Next Generation Oil Based Food Colours - 100 ml
Colour Mill Oil Based Next Genertion Edible Food Paint Colouring for Buttercream Fondant Sugarpaste Icing and Chocolate - Merlot 20ml
Colour Mill Oil Based Food Colouring - Merlot 20ml
Merlot - Aqua Based Colouring 20ml - Colour Mill
Merlot - Water Based Food Colouring 20ml