How do we separate different food colouring in a drink?

To separate different food colorings in a drink, you can use a technique called chromatography. This involves applying a small amount of the colored liquid onto a chromatography paper or strip, then placing the paper in a solvent, such as water or alcohol. As the solvent travels up the paper, it carries the different color pigments at varying rates, allowing them to separate into distinct bands or spots. Once the process is complete, you can observe the individual colors that were mixed in the drink.