Colour wash is a technique used in interior design to create a soft, muted effect on walls and surfaces. There are several synonyms for colour wash which also offer unique design options. For example, a whitewash effect can be achieved by diluting white paint with water and using a paintbrush or rag to wash it over a surface. A limewash effect can be created by applying a mixture of lime and water to a surface which offers a natural, textured finish. A sponge or ragging technique can also create a stippled effect which is similar to a colour wash, adding depth and texture to a room.