Illustrator question

i work a lot in illustrator, and one thing i noticed that really bothers me is when i’m making a dark shape, lets say black, and i make a rather dark shape inside of that, lets say navy blueish, there is little white stuff visible on the outside of the blue shape, VERY little, but visible. i know this prints fine, but it looks weird in illustrator and bothers the living crap out of me. it seems like when illustrator has to display two shapes with dark colors, it needs to distinguish them somehow and shows that little white around the border. i don’t know if this makes any sense but does anyone know how to get rid of that or a way around it?