Red light IS scattered as well, but it is scattered back out into space once the Sun gets far enough above the horizon. The red, pink, orange and yellow light at sunrise and sunset is because those red rays are being scattered and refracted toward the ground when the Sun is close to the horizon at sunrise and sunset. Once the Sun has a high enough altitude, the red light is scattered into space. Have you EVER really looked closely at those images taken from inside the Space Shuttle that show the Earth at the "bottom" of a window and the layers of atmosphere above Earth, and the blue and PURPLE/VIOLET layers of the atmosphere. Blue + red = violet. That's where those refracted red rays go and mix with the scattered blue rays of light to produce a violet layer at the top of the atmosphere that can be seen ONLY form Low Earth Orbit.
Turquoise Blue - The Sun's EM radiation peaks at the yellow green wavelengths of the visible light spectrum. See if you can find a web site where you can play with an 8-bit red-green-blue color scale and can mix colors . Don't be surprised when equal amounts of blue and green and no red produce EXACTLY the colors of the sky. The digital values of the colors on an 8-bit scale range from 0 (black) to 255 (white on an 8 bit gray scale).
That just leaves white clouds to explain. Water molecules, whether water vapor or condensed into water droplets that form clouds, have a larger diameter than most air molecules, so they preferentially scatter ALL the colors of the visible spectrum so that they appear white to gray to almost black. This is Mie scattering.
DUST clouds formed from sand, clay, and silt sized particles in the air can be yellow to red BECAUSE OF THE SIZE OF THE DUST PARTICLES and Rayleigh scattering.
OK! Sources
http://hyperphysics.phy-astr.gsu.edu/hba…
en.wikipedia.org/wiki/Additive_color
www.worqx.com/color/color_systems.htm
http://www.edumedia-sciences.com/en/a285…