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...
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...
