Blue and violet makes what color?

blue and red with more blue than red

you cant make dark blue enless you have blue because it is a primary color you can not mix any color to get a primary color to get dark blu use blue and a little bit of black

Blue with a little black added to it if your talking artistically (such as with paint). Blue itself is a basic color. To darken add black, the more black the darker the blue. Just the opposite with...

Purple

You don't. It's a primary color.