One of my concern is that the purple color is hard to differentiate from the blue color. My aim of posting these pictures is to show that those two colors are indeed differentiable. When being put side by side with chocolate / brown, the purple will look like blue. But when being put side by side with blue, the purple look like brown. So, purple is indeed a color spectrum between the blue and the brown, and differentiable from the two. The pictures below show the difference between blue and purple. I hope it is clear which one is which 🙂 Have a good day.