L’Oreal Professionnel Serie Expert Metal Detox Mask 250ml features a anti-deposit protector mask protects the fiber from particle deposits after any color, balayage or lightening service. It maintains color vibrancy with intense shine. Hair is instantly smoother, softer & more nourished. Metal inside the fiber creates both a risk of breakage and negatively impacts color results during colour, balayage and lightening services. The level of metal in hair varies, depending on hair porosity and on the water quality where we live.