SHINE IN YELLOWOUT™ takes yellow stains out of hair and gives dull hair of every colour a more brilliant sheen. It leaves hair silky, shiny and smelling good. Directions: Apply to wet hair, massage in until blue suds turn white. Soak for two to five minutes, then rinse well before repeating, if necessary. Permanent Stains: Nature can permanently stain hair colour. To determine if a stain is permanent or not, soak stained hair in a 50/50 mixture of vinegar and warm to hot water for two to five minutes. Re-apply SHINE IN YELLOWOUT™ per directions. If stain persists it may be permanent. Continue to follow directions to minimize permanent yellow stain until hair can grow out