Abstract: Detergent tablet comprising two layers reactive during dissolution, separated by a barrier layer The present invention relates to a detergent tablet consisting of at least three separate layers, two outer layers being separated by a middle layer, wherein: (i) the first outer layer comprises at least a first compound—detergent agent and/or bleaching agent—which can react chemically with at least a second compound—detergent agent and/or bleaching activator—contained in the second outer layer, and (ii) the middle layer is chemically neutral toward the compounds of the outer layers, and (iii) the compounds of the outer layers react with each other when the tablet is immersed in aqueous medium to form at least a third compound with enhanced detergent and/or bleaching properties.