The human retina contains three types of cone cells that absorb light in different parts of the spectrum. ABsence of these types causes colour Blindness to red, green, and Blue.

人类视网膜中有三种锥体细胞能吸收光谱不同部分的光，缺少其中一或多种细胞便会造成色盲。

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Blue and yellow tones work effectively but not red or green because of canine colour-blindness.

BBC: New TV channel for dogs sets tails wagging in Israel

In a series of five studies, about 150 heterosexual men (homosexual men and those with red-green color blindness were excluded) rated photographs of women framed in red, white, gray, green, or blue, or with the woman in a red or blue shirt.

CNN: Wearing red may boost your sex appeal