Finally, some real scientific research on whether professional or supermarket products are better at caring for coloured hair. The Product Advisor website looks at a number of well known supermarket and professional brands, testing them out and assessing their performance. Which performed better? We’ll give you a hint – the professional products outperformed the supermarket ones, with Wella’s Brilliance shampoo being voted the star of the show when it comes to caring for coloured hair. A great video – show it to your clients!