In
all cases the color assumed by the yak hair has been evaluated using the colorimetric CIE La*b* Space system [7] which main parameters are: lightness (L*) whose values run from 0 (black) to 100 (white), a* (on the aea’ axis, positive values indicate amounts of red while
negative values indicate amounts of green), and b* (on the beb’ axis, yellow is positive and blue is negative). For both axes, zero is neutral gray. Other parameters belonging to CIE L*C*h polar color space system [7]