Hmmm, that's an interesting question. I'd think that it would be just like selective breeding with any other morph. But then again I've seen the results of a couple spider clutches that were just all over the place. All the spiders in one clutch (I think he got 5 total) looked just completely different. I think the spider gene may just be really variable.

I want to say though that if you bred a nice high white spider to a normal that had some nice white borders to their pattern that may increase your chances of having nice high white spiders. But I couldn't say for sure. I'd think your best bet would be to breed a nice high white spider to another high white spider if that's what you're looking to get from the clutch.