why sunsets have orange, red and purple, while purple is on the complete other end of the spectrum

Question

why sunsets have orange, red and purple, while purple is on the complete other end of the spectrum

In: Physics

Answer 1

[According to this site](https://spaceweatherarchive.com/2019/08/27/why-are-sunsets-turning-purple/), it’s due to volcanoes:

> Fine volcanic aerosols in the stratosphere scatter blue light which, when mixed with ordinary sunset red, produces a violet hue. The purple color is often preceded by a yellow arch hugging the horizon. As the sun sets, violet beams emerge from the yellow, overlapping to fill the western sky with a soft purple glow. High-quality pictures of the phenomenon often show horizontal bands cross-crossing the yellow arch. These bands are the volcanic gas.