Color Spectrum And Particle Size

If we make a guess at the color spectrum as due to particles of increasing size, and align the blue region with small $a_{\psi\,c}$ particles,

The ultraviolet region ends abruptly with the smallest $a_{\psi\,c}$ but the infra-red region extends indefinitely with increasing $a_{\psi\,\pi}$ that can exist in  high intensity fields (high temperature, high acceleration, high voltage).

And neutral $a_{\psi\,ne}$ is without a charge may just be invisible.