Goldwell Men ReShade Developer Concentrate is a professional activating lotion designed to visibly reduce gray hair in just 5 minutes. It is used exclusively mixed in a 1:1 ratio with the Grey Blending Power Shot capsules from the same range. Processing time: only 5 minutes. Natural finish: transparent effect without visible "root" effect during regrowth. Easy application: use with a special applicator bottle to transform the mixture into foam. HOW TO USE Pour 20 ml of developer concentrate and 20 ml of the chosen shade Power Shot into the dedicated applicator bottle. Gently shake the bottle to mix (do not shake vigorously). Apply the foam on damp hair, massage evenly. Leave on for 5 minutes, then rinse thoroughly and shampoo.