Shaping keratin fibres using carbonate ester

A method for shaping keratin fibres comprising:

• (a) providing a crosslinking composition, wherein the crosslinking composition comprises:
• an active agent, wherein the active agent is a carbonate ester;
• and wherein the active agent has a molecular weight of about 500 g/mol or less;
• a photocatalyst being a hydroxy-substituted aromatic compound;
• a cosmetically acceptable carrier;
• wherein the crosslinking composition has not been exposed to electromagnetic radiation having a wavelength of about 750 nm or less for about 30 min or more;
• (b) applying the crosslinking composition to keratin fibres, mechanically shaping the keratin fibres with an appliance at a temperature of from about 80° C. to about 180° C. and exposing the composition to electromagnetic radiation having a wavelength of from about 300 nm to about 750 nm.