How to change a paint color?

I purchased some paint that I cannot return. It is a light blue, but has too much purple in it. If I put all of the paint into a large container, what can i add to it to make it bluer ThanksHow to change a paint color?
If it's too purple, then there's too much red tint. Mix a sample in a pail with white paint, then add a grayish blue. Keep track of your ratio of paint as you mix colors so you can replicate the color you like.How to change a paint color?
Usually the paint store will add some black to darken the color, even if you can't return it. Try at least calling the paint store, because it's hard to mix in the black on your own and get it as smooth as they can with the shakers. I've had this done a few times.