A new study has upended our perception of the colour wheel, revealing that purple is not a "real" colour in the spectral ...

blue and red start to come together. And that coming-together point is called purple.” That’s because it’s not a spectral color. Moreover, our eyes use cone cells to detect color—short (S ...

why didn’t people just combine blue and red? Illustration by Aurélia Fronty Q: I’ve heard that purple was called the royal color because purple dye used to be scarce. Why didn’t people just ...