Home / Salon Services & Prices / Perming Perming Matrix Opticurl Perm NEW Opti-Curl Advanced Formula works with differences in the hair's porosity. Resulting in springy, FIRM, perfectly formed curls in normal, resistant and colour treated hair (up to 20 Vol) Opti.curl's gentle, self-adjusting formula provides predictable, even curl results. The patented technology leaves hair looking natural, soft and well-conditioned. Ester-free formula that adapts to differences in hair porosity. Delivers springier, firmer curls for normal, resistant and colour treated hair (up to 20 volume).