In 1872, Marcel had introduced his famous Marcel wave using a heated iron that imitated the natural curl of the hair. Hot tongs were applied to produce a curl rather than a crimp. Done at intervals over the head, the hair would assume the look of moiré. It revolutionized the art of hairdressing all over the world. The Marcel wave remained popular for almost half a century and helped usher in a new era of women's waved and curled hairpieces, which were mixed with the natural hair.