When you look at concrete you will see different structures and colour shades. Use your creativity to create these structures and colours.
The surface gets a first layer of paint in the colour Montmartre Grey with a roller or blockwitter. Then use a coarse brush to create stripes on the wall in the colour Cornwall Black. Open the paint by wiping over the Cornwall Black with a wet stockinette (a cotton-based cloth that takes up a lot of water and paint). Finally, wipe over the surface with a dry cloth or brush for a smooth effect.