Derwent Grate 'n' Shake, Art Supplies (2300450) Mix paint and create your own colors; grate your Intense or Aquatone sticks into water; shake the container to create your custom paint Ideal for creating translucent color washes or painting ink to cover large areas; plastic container; metal grate Have fun with the Derwent Grate 'n' Shake. Designed for use with Inktense blocks, the Grate 'n' Shake allows you to mix paint and create your own colours. Grate the Inktense Blocks into water and then shake the container to mix the pigment.