At peak saturation, blue has the lowest luminosity, which gives it the greatest contrast against white. Purple, magenta, and red are next. That's why we use bl

At peak saturation, blue has the lowest luminosity, which gives it the greatest contrast against white. Purple, magenta, and red are next. That's why we use blue and purple for links and not yellow. It's really about achieving contrast and saturated/vibrant colors at the same time.