driftwood

Any reccomendations on what wood makes the best/hardiest driftwood? I'm guessing just about any hardwood (provided it's "processed"), right?
 
Great news, the driftwood I have been soaking for over three months (Which I left out in the sun!) Has finally stopped leaching tannins. I left it in the sun for a week and decided to give it one more go and it worked!!
 
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