The three primary colours: red, yellow, blue are colours that can't be created by mixing colours. Obviously, adding white to blue will lighten it, and adding black would darken it. But it is best to use the commercially produced various shades of blue that are available in an artist supply shop, etc.
You can mix blue and yellow to make green.
The colors you mix with sky blue to get navy blue would be a dark blue or a black. These will make a navy blue.
Yellow and Blue.
red and blue
yellow and blue.
blue
Blue and Red
Blue and red mix to make purple. Mixing these two colors together creates a new color, which is purple.
Red, blue and green make yellow
You cannot mix any color with blue to get red. Blue and red are primary colors.
Red and blue make purple.
To make light blue mix blue with white. Start with the white and add a little blue at a time until you have the shade you want.