Discover our exclusive technology* with the Opti pH System that helps rebuild hair structure to strengthen it during and after lightening and coloring treatments, while ensuring perfect results for these treatments. The first. Bond Maker helps rebuild the internal joints of the hair during bleaching or coloring treatments. It has a pH of only 9, which matches perfectly with the pH of the bleaching and coloring Wella Professionals, allowing optimal elevation and penetration of dye molecules while reconstructing the bonds simultaneously. Two. Bond Stabilizer further strengthens the internal joints of the hair and rebalances the pH.