what is the best shampoo and conditioner for coloured hair?
['Joico K-Pak Colour Therapy Shampoo.', 'Paul Mitchell Color Protect Shampoo.', 'Redken Colour Extend Magnetics Shampoo.', 'System Professional Colour Save Shampoo.', 'Pureology Hydrate Colour Care Shampoo.', 'Color WOW Color Security Shampoo.', 'TIGI Bed Head Colour Goddess Shampoo.']