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Solid shade on fibre blends especially made of similar fibres is a real challenge even to expert dyer. Superwash wool and degummed silk fibres are dyed separately with Optilan (acid), Lanasyn (1:2 metal-complex) and Drimarene (conventional reactive) dyes by conventional methods. The lightness, hue angle and colour differences ( CMC) between dyed wool and silk are measured. Silk samples are found to be lighter in shade. Silk dyed with three yellow dyes are greener as against respective dyed wool, while silk dyed with three red dyes are bluer as against respective dyed wool. Similar colour differences are observed for Optilan and Lanasyn dyes, while Drimarene dyes showed higher differences. The visual colour differences are assessed by grey scale and are transformed into CIELAB colour differences. Visual colour differences are always much lower as against instrumental colour difference. The best overall performance in terms of lightness, hue angle and colour differences between dyed wool and silk was of Lanasyn dyes followed by Optilan dyes. Drimarene dyes performed worst in this regard. [ABSTRACT FROM AUTHOR]