Abstract: A solid, particulate composition including at least one water-soluble carrier material, at least one fragrance and at least one bittern, the carrier material being an aqueous salt (hydrate) of which the water vapor partial pressure at a particular temperature in the range of from 30 to 100° C. corresponds to the H2O partial pressure of the saturated solution of the salt such that the salt melts in the water of crystallization thereof at the temperature. In addition, the invention relates to methods for preparing the solid composition and to a washing or cleaning agent that contains the solid composition. Furthermore, the present invention also relates to the use of a washing or cleaning agent of this kind for cleaning textiles or hard surfaces and to corresponding methods for cleaning textiles or hard surfaces by using a washing or cleaning agent of this kind.