Wella Color Touch Emulsion 4% works with Wella Colour Touch demi-permanent dyes to create vibrant developed colour. The silky formula of Colour Touch Emulsion melts into hair. In addition results in intensely rich, glossy colour for your clients.Low commitment, ammonia free, multi-dimensional demi-permanent hair colour for clients who like to change their tone more regularly.4% is recommended for use on grey hair and works better to keep colour in longer when using the Vibrant Red Collection. Perfect for use on coarse hair.