Abstract: A process is described in which a particulate detergent composition which is speckled in appearance is made by spraying an aqueous coloring medium, such as dye solution, containing polyacrylic acid, onto the surface of a moving bed of detergent composition particles containing an alkaline builder, thereby forming a coherent colored surface section or "skin" of detergent composition particles. The coherent section or skin of particles is next broken up and the colored particles are mixed with uncolored particles from the bed to make the speckled detergent composition. Normally, the bed of detergent composition particles is on a moving conveyer belt, which conveyer belt is preferably a weigh-belt, and the amount of coloring medium being sprayed onto the moving bed is automatically regulated by the weight of detergent composition particles on the belt passing under the spray nozzle(s), and the belt speed.