The X2 Orange can be strange. I think it depends on how strong of a color you mix it to be. I am also convinced that by keeping the color (all X2 colors for that matter) thoroughly mixed all the times it will not bleed. I feel that there may be a component in the Orange that settles out and if it's not completely mixed back in bleeding can occur. I've only had a bleeding issue with the Orange twice in all of the years I have used it.