The term 'Colour Changer' refers to two different processes used to alter the colour of a material. The first is TONER, which is a powder or liquid that is applied to the material and then heated or exposed to light to change its colour. The second is DYE, which is a chemical that is added to the material to permanently change its colour. Both processes are used in a variety of industries, such as printing, textiles, and cosmetics.