Does anyone have any experience working with this material?

I have some questions about it. Not looking to make scales but a holder for a kamisori. Something like this but not just a block with a few grooves routed in it.

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I want to take a block like these and round off the corners and make a more wave shape concept to it with no corners or sharp edges. I have a rounded wave pattern in my head thats hard to describe.
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My question is, does the stain run all the way through once its been stained and stabilized from the supplier so that I when I sand/carve the block it will retain the contrasting colors? Or will I need to restain it once I start removing material?