Question

how to make sky blue colour​

Answer 1

White light is made of different colors:VIBGYOR. Because of the shorter wavelength, blue gets scattered more in the atmosphere.Thus, we see the sky as blue in colour.

Answer 2

Explanation:

Start with a generous amount of white and add blue to it. Many blues will work, but Ultramarine Blue is a good color to begin with. To make it a reddish blue, add a small touch of magenta. To create a duller blue, add a touch of yellow along with the magenta.