nope. again incorrect... the type on most whites i've seen is awesome, if they came from a reputable breeder.So what I would want to do is build to the best type possible and not be concerned with any thing to do with colors except to keep the white pure white. Is that correct?
i did read somewhere here that the white should be breed back to black to strengthen type. Is this correct?
the same for a number of blacks.
so if you want to improve type on a white, go to a better breeder of whites. don't color cross or you'll spend years getting back to a nice pure white.
the ONLY time i would outcross to another color, would be with some of the rarer colors that are harder to find. like the silver and gold laced, you *could* cross together if you've got one that's much better than the other, and spend a couple generations getting back to the proper color. or worst case, you could outcross one of those to the columbian/buff columbian, or partridge/silver penciled, since both of those varieties include mutations needed for lacing. that kind of thing. those are merely side-steps from what you have/want.
but both black and white may hide a number of mutations that are not desirable and may be difficult to get rid of once they crop up.