Posts by Austin Hemmelgarn
As has been mentioned in other answers, for vision, a pinhole device, similar to what is used for pinhole cameras, is your best bet. Short of water (which you have already ruled out), that's about...
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It's hard to be absolutely certain without a specific goal for the firewood, but there are some generic things to look for: Sap: Sap-rich woods usually produce a lot of smoke, often black or dar...
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