Colouring substances are materials used to add colour to a variety of surfaces. DYE, with three letters, is a substance that is applied to a material to give it a permanent colour. PAINT, with five letters, is a liquid or paste that contains pigments and is used to colour a surface. DYESTUFF, with eight letters, is a substance that is used to colour fabrics, leather, paper, and other materials. All of these substances are used to create vibrant colours and can be used for a variety of purposes.