The invention provides an effervescence particle comprising an anhydrous perborate salt intimately mixed with a diluent, with the proviso that the diluent is not sodium perborate monohydrate. The invention also relates to processes for making the particle and to detergent compositions comprising such a particle. The invention also relates to the use of such an effervescence particle in a detergent composition for improvement of the dispensing or dissolution of the detergent composition into the washing water or for improvement of the delivery of detergent actives of the composition to the wash or for improved sudsing.
