The present invention relates to a solid bleaching composition comprising at least one chlorinated bleaching and detergent agent selected among the dichloroisocyanurates and at least one optical brightener, characterised in that the pH of said composition is between 5 and 9, and in that the dissolution time of said composition in an aqueous solution is between 30 seconds and 20 minutes. The present invention likewise relates to the use of such a composition for bleaching a fabric, while protecting the textile fibres, as well as disinfecting and washing same.