Color is not a property of wavelength. There's nothing special about photons wiggling in the 380 to 750nm range.
In general it's not necessary to be this pendatic, but given the topic here, I think it's important to realize this. It takes a while because we are so good at projecting our internal experience outward.
Remember the blue / black dress?
It was, by definition
> Color is not a property of wavelength.
Sure, it's a label
> There's nothing special about photons wiggling in the 380 to 750nm range.
There is - they activate different receptors your brain relies on, hence leading to a distinct (from other wavelengths) sensation
What if we were sensitive to the 200 to 500nm range? What would be blue, violet and red then?
Our eyes and brain are the one constructing what we perceive as color. It doesn't exists outside of us.
Here's good article on the subject: https://anthonywaichulis.com/regarding-perception-photograph...
"Purple" is a mixture of red and blue.
And as such, they are both a construct of the brain, as any other colors, like... white.
What we label as "violet wavelength" is only a narrow projection of our experience outward. Case in point, we don't have such colorful (eh) names for other EM wavelength.
I say narrow because you could take this pure laser and change th surrounding and you will inevitably perceive it differently, even though the power and wavelength are the same.
Magenta and purples are constructs by the brain, as you mention.
If I shine some wavelength to your eyeball and you say "it looks blue", but then I change the surrounding and now it looks white, I don't think you would conclude that the original wavelength is blue.
We have a many examples like this, which prescribe that vision is not at all an accurate wavelength measurement device.