Yes, it's only the cheapest "white" LEDs that have a decidedly bluish or even purplish tinge. The better makers separate them into color of white, and you pay a lot more for them too...generally this is only done for the LEDs that are more expensive to start with, like 1W+ Luxeon etc.

There are numerous ways to get white, but the most effective one seems to be using very complicated chemical coatings that act as filters.

The cheap "white" LEDs are OK when you just need light, not for pros.