Goldwell Dualsenses Color Extra Rich Serum Spray for Thick to Coarse Color Treated Hair. Goldwell Dualsenses Color Extra Rich Serum Spray promotes colour brilliance and shine in thick and coarse, colour treated hair. Infused with Raspberry Seed Oil, featuring Goldwells innovative Color Chroma Complex and a unique Fade Stop Formula, Dualsenses Color Extra Rich Serum Spray regenerates and restructures hair to restore colour vibrancy and shine in colour treated hair. Maintain your salon-perfect colour with this luxurious leave in treatment spray.