I was fed up with the brassy look which I always had 3 weeks after professional colouring, so tried Tints of Nature home colouring kit, which is free from ammonia, resorcinol and parabens, and a very gentle way to colour hair as most of the ingredients are also organic. I am someone with multiple allergies but have been fine with this, and goodbye brassiness. I get it from Amazon and one pack lasts at least 4 applications as I have short-medium length fine hair, so it's much cheaper than a salon, and I will never return to salon treatments.