You get a darker blue.
A darker blue, or with too much black in it, black.
a very dark shade of that color example blue+black=navy blue
black
black
black and blue and silver
black.
BLACK
Black and a little yellow
You have to mix the three primary colors: Blue, Yellow, and Red.
You can't mix two colors to get blue, but you can use blue and white to get light shades of blue and black to get dark shades.
Mix black with blue to get indigo. But be careful, begin by mixing a small amount of the black into the blue and check you results. You can always add more black if the color does not seem right at first try.
You get this really ugly brownish black color.