J.F. Lazartigue's Colouring Emulsion in Dark Blonde enables you to cover up to 100 percent of grey hair, freshen up your natural colour and regain healthy hair even after the damaging effects of sun, pollution, or previous successive colour treatments. Free from ammonia and peroxide it is a new way to colour, treat and protect your hair for a permanent hold without damaging it. J.F. Lazartigue Colouring Emulsion in Dark Blonde for grey hairPermanent colourf.lazartigue colour application brush. Leave on for 15 30 minutes. Rinse well. Take the Neutralizing Bath sachet included in the box, dilute in a small amount of water, apply and work to a light lather. Rinse well and then use the Moisturising Shampoo for Colour Treated Hair60ml. Colour Emulsion for Grey Hair in Dark Blonde 60ml