Affinity proteins for controlled application of cosmetic substances

A conjugate comprising a proteinaceous substance having specific affinity for a target molecule linked to a cosmetic substance, wherein the resulting connection between cosmetic substance and target molecule can be disrupted upon the presence of a chemical and/or physical signal, and further wherein said proteinaceous substance comprises a synthetic or recombinant proteinaceous molecule comprising a binding peptide and a core, said core comprising a beta-barrel comprising at least four strands, wherein said beta-barrel comprises at least two beta-sheets, wherein each of said beta-sheets comprises two of said strands and wherein said binding peptide is a peptide connecting two strands in said beta-barrel and wherein said binding peptide is outside its natural context.

A divalent or multivalent proteinaceous substance having specific affinity for at least two target molecules present in hair and wherein epitopes recognized on said at least two target molecules may be the same or different.