The document discusses colour perception in textiles and the effects of Amplify-BLACK treatment. It notes that human vision can perceive 6 basic colours and describes how textile colour is influenced by factors like fibre type and dyeing processes. It then explains how Amplify-BLACK intensifies colour by making textile surfaces smoother to reduce light scatter and lowering the refractive index to extend the path of light through dyed fibres. This allows for better light absorption and significantly darker, more vibrant colours.