Data were recorded as CIE L⁄ values indicating lightness, as well as Chroma value of (a2 + b2)1/2 and Hue angle of tan1(b/a) to represent the saturation and shade of the colour, respectively.
Data were recorded as CIE L⁄ values indicating lightness, as well asChroma value of (a2 + b2)1/2 and Hue angle of tan1(b/a) to representthe saturation and shade of the colour, respectively.