A 1929 article from The Melliand on how lighting affects color perception and discrimination in textile factories. It covers the effect of illumination intensity on different hues, eye fatigue and reflex action, variation in daylight, individual differences in color vision, and the use of mercury, incandescent, and mixed lighting for color matching. Examples are drawn from hosiery, woolen and worsted weaving, carpets, and patterned knitting.