A method of disseminating to where it is required a substance that is advantageously disseminated after undergoing a heat-induced change of state or heat-induced fluidification, comprising the provision of the substance in a container that comprises a secondary induction coil, the container being adapted to be used in association with an apparatus provided with a primary induction coil, the coils being in a heat-providing relationship when the container is in association with the apparatus, and providing to the primary induction coil sufficient electricity to generate the necessary heat in the secondary induction coil. An apparatus to achieve this is also provided. Control of the temperature attained in the container may be regulated by choice of coil construction and positioning, thus permitting many different applications (air freshening, skin and hair care materials, cleaning and polishing materials) from a single base unit with a primary coil.