If you're using laquer, there are toners, and shaders. I can't remember right now which is which, and I'm too lazy to dig out my books, but basically, one is transparent, the other is opaque. It depends on what type of color is added to the clear base. A TINT creates a transparent color coat, allowing the grain to show through, or in the case of a candy finish, sometimes an opaque metalic color underneath. If you add a PIGMENT, you get an opaque finish, basically paint. If you're planning on using a laquer finish, it's important to remember the difference. If you want that flamed maple top to show through the color, then you tint the finish, with a product like Trans-Tint. If you want a solid color to hid an ugly Alder body, you would use a pigment, such as Stew Mac's. Hope that helps.
-Rob