Goldwell Dualsenses Color Brilliance Serum Spray 5.1 Ounce 150 Milliliters Protect and treat normal to fine hair. The Goldwell Dualsenses Color Brilliance Serum Spray for fine to normal, color-treated hair works to keep color brilliant. Goldwell Dual Senses Color Brilliance Serum Spray is for fine and normal hair, which can be used for colored and non-colored hair.