A process in which the bulk density of a particulate detergent material is increased starting from an initial bulk density of at least 600 g/l, by spraying a liquid onto the particles and dusting with a fine powder in one or more rotating drum(s) or mixer(s), characterised in that the particulate detergent material initially has a mean particle size greater than 400 micrometers, and that the increase in the mean particle size during the process is not greater than 60 %. The invention also discloses a detergent composition having excellent dispensing and dissolving properties.