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Shade is a characteristic that's possessed by hardly any mammals. K.Tansely in one of his books on visual system that the vision in vertebrates commented that "On the whole mammals seem not to have color vision, except for the primates where it's well developed and almost certainly trichomatic". The term trichomatic was originated from a concept given by French physiologist Palmer in 1777 that stated that the presence three unique types of unlimited number of molecules present in the retina. All these types are for discovery of colors like red, blue and yellow. Few years later Thomas Young postulated the presence of three kinds of cones that are responsible for the detection of these primary colors or metamers and their concept of empirically proven by Maxwell at 1860. This trichomatic character of understanding of human retina appeared a limit as human eye can perceive millions of colors. These millions of colors are confined to a Grassman's laws explained additive, scalar and associative properties of metamers to prove different combinations of colors perceived by visual system. The human array of perception of light is from 380nm to 760nm. The perception of color depends upon photo-receptors capacity to segregate different wavelength. The Bowmaker et al in 1979 was able to spot the cone using micro-spectrometry by seeing cone absorption spectrum.The cones were in blue, green and red spectrum with wavelength of 420nm, 534 nm and 564 nm. The rod that was identified absorbed the spectrum at 498 nm. The results on the absorption spectrum were quite similar to the results found on Rhesus monkey by the same author. *Bowmaker et al.. The name given to cones on the absorption spectrum are S(Short), L(Long) and (M) moderate. T.. .