This No Yellow Duo will neutralise unwanted and brassy tones, whilst hydrating and conditioning dry and damaged hair. How to use: Apply on shampoo damp or dry hair 1-5 minutes and rinse off; for a stronger effect, leave on 5-15 minutes. Can be used once a week or when yellow is visible. Apply Mask to damp hair. Leave on for 3-5 minutes and rinse. Use once every week or every 2 weeks. Made in Italy Product must be used within 12 months of opening. Please refer to the ingredient list on your product package for the most up to date list of ingredients to ensure it is suitable to your personal use.