Obviously softwoods will tend to be softer than hardwoods, but try to get a sense of how it compares to other known woods. Density and hardness are closely related, so if the wood is heavy, it will most likely be hard too. If the wood is a part of a finished item that you can’t adequately weigh, you might be able to test the hardness by gouging it in an inconspicuous area. Also, if it is used in a piece of furniture, such as a tabletop, a general idea of its hardness can be assessed by the number and depth of the gouges/dings in the piece given its age and use. A tabletop made of pine will have much deeper dents than a tabletop made of Oak. Additionally, you can always try the “fingernail test” as a rough hardness indicator: find a crisp edge of the wood, and with your fingernail try to push in as hard as you can and see if you’re able to make a dent in the wood.
Do it yourself, also known as DIY, is the method of building, modifying, or repairing something without the aid of experts or professionals. Academic research describes DIY as behaviors where "individuals engage raw and semi-raw materials and component parts to produce, transform, or reconstruct material possessions, including those drawn from the natural environment (e.g. landscaping)". DIY behavior can be triggered by various motivations previously categorized as marketplace motivations (economic benefits, lack of product availability, lack of product quality, need for customization), and identity enhancement (craftsmanship, empowerment, community seeking, uniqueness). Some hardwoods are becoming very hard to find and are being harvested without concern to their eventual extinction (Brazilian rosewood comes to mind). Not only is this hard on the environment, it drives the price of the wood so high that making furniture out of it is out of the question for most woodworkers. If you can, try to buy wood from a sustainable forest (commercial tree farms that ensure the supply of the wood). Check out the National Hardwood Lumber Association for ways to support sustainable forestry.
Sometimes a wood species will have heartwood extractives that will be readily leachable in water and capable of conspicuously tinting a solution of water a specific color. For instance, the heartwood extractives contained in Osage Orange (Maclura pomifera) contain a yellowish-brown dye that is soluble in water. (This can sometimes be observed anecdotally when the wood is glued with a water-based adhesive: the glue’s squeeze-out is an unusually vibrant yellow.) In a simple water extract color test, wood shavings are mixed with water in a vial, test tube, or other suitably small container, and the color of the water is observed after a few minutes. If the heartwood extractives are leachable by water, then a corresponding color change should quickly occur. In addition to Osage Orange (Maclura pomifera), Merbau (Intsia spp.), and Rengas (Gluta spp. and Melanorrhoea spp.) are also noted for their readily leachable heartwood extractives. Because this property is quite uncommon, it can serve to quickly differentiate these woods from other lookalikes.
If there is even a chance that the color isn’t natural, the odds are increased that the entire effort of identifying the wood will be in vain. Many woods, when left outside in the elements, tend to turn a bland gray color. Also, even interior wood also takes on a patina as it ages: some woods get darker, or redder, and some even get lighter or lose their color; but for the most part, wood tends to darken with age. The most predictable baseline to use when identifying wood is in a freshly sanded state. This eliminates the chances of a stain or natural aging skewing the color diagnosis of the wood. Most softwoods will be almost perfectly smooth with no grain indentations, while many common hardwoods have an open pore structure, such as Oak or Mahogany; though there are some hardwoods that are also smooth to the touch, such as Maple. By observing the grain patterns, many times you can tell how the board was cut from the tree. Some wood species have dramatically different grain patterns from plainsawn to quartersawn surfaces. For instance, on their quartersawn surfaces, Lacewood has large lace patterns, Oak has flecks, and Maple has the characteristic “butcher block” appearance. Some species of wood have figure that is much more common than in other species: for example, curly figure is fairly common in Soft Maple, and the curls are usually well-pronounced and close together. Yet when Birch or Cherry has a curly grain, it is more often much less pronounced, and the curls are spaced farther apart.
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