Well, I need to bleach some wood for the commission so I have been playing with different methods. The first method I tried was to use Oxalic Acid. It didn't do anything. Today I was able to locate some sodium Hydroxide and hydrogen peroxide. The method is to put the sodium hydroxide on first and teen minutes later use the hydrogen peroxide. Here are the results of two identical pieces the one on the right is unbleached. the wood is soft maple.