I need some help with bleaching

I am working on couple fairly traditional hall tables. And I would like to try bleaching the Ohia I will be using. Ohia is very similar in appearance to walnut in both grain and color. The ohia grays very evenly when exposed to direct sun. I plan to ebonize the legs and top which I have done in the past with a simple steel wool vinegar solution, but I want to bleach a carved accent that will hide the aprons. And I haven’t had any luck thus far lightening, or whitening the wood.

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