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You might look into making your own charcoal rather than using wood - charcoal is wood whose long chain hydrocarbons (tars) have been cooked off, leaving a much cleaner burning fuel. Using wood can be done, but it is A) smokier because of those long-chain things, B) not as hot - long chain things don't burn as well, and C) you're liable to be introducing impurities (unburned long chain things) into your metal - perhaps not a big deal for decorative work, but as soon as you want something like a tool, you will want predictable, clean metal to work with....
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