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Baking soda reacts chemically with tannins, which are acidic compounds found in plants, including trees. Some types of wood have greater concentrations of tannins than others, though. These include cedar, pine, red oak, redwood, and mahogany, among others.  Woods that are harder and darker have more tannins. The concentration of tannins varies from tree to tree—this means that 2 cedar boards may age differently when treated with baking soda. Consider these differences and imperfections part of the aging process.  You can use baking soda on woods with low concentrations of tannins, but the results will be much less noticeable. You’re better off trying a different aging technique. You can certainly age pristine, freshly-cut wood with baking soda. However, to save some money or make use of wood you already have around, try using cast-off, damaged, or otherwise imperfect wood. The aging process will make beauty of the wood’s imperfections. If you want to “rough up” wood that is pristine, you can beat it up with tools, such as a bag of screws or a hammer. Hit it repeatedly or drag the sharp ends across the wood’s surface. (and strip it if necessary) if it has been finished. If the wood you want to age has been previously painted or stained, sand off the top layer to expose the untreated wood below. For wood that has been painted more than once, you may need to use a chemical stripper.  Wear safety goggles, long-sleeved work clothes, and gloves when you use a sander or chemical stripper. Work in a ventilated area, such as an open shop or garage, when using chemicals. If you want your project to look older and more distressed, you can leave some paint on portions of the wood. If you’re aging 1 or several individual boards, set up 2 sawhorses so that you can lay the wood on top of them. If you’re working on a piece of furniture or something else that won’t easily rest on sawhorses, lay out a dropcloth on the ground.  Exposing the wood to direct sunlight will speed up the baking soda aging process. It will still work without sunlight, but the baking soda application will take longer to dry, and you’ll probably need to reapply the baking soda more times to get the look you want. If you want to age both sides of a board, finish aging 1 side, then turn it over and do the other side.
Choose a wood variety with tannins for the most noticeable impact. Turn flaws into highlights by aging imperfect wood. Sand the wood Lay the wood on sawhorses or a dropcloth in a sunny spot.