Abstract: Material for decorating textile fabrics under the action of heat and pressure comprises a flexible substrate having thereon a transferable layer which comprises a dye or pigment, a film-forming polymer, a crosslinking agent capable on curing of rendering the film-forming polymer insoluble and a thermally activatable catalyst for promoting the crosslinking reaction, the catalyst comprising the salt of one or more strong acid groups with an organic base and a salt of one or more weak acid groups with an organic base.