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 it’s possible, pick the piece of wood up and get a sense of its weight, and compare it to other known wood species. Try gouging the edge with your fingernail to get a sense of its hardness. If you have a scale, you can take measurements of the length, width, and thickness of the wood, and combine them to find the density of the wood. This can be helpful to compare to other density readings found in the database. Wood from freshly felled trees, or wood that has been stored in an extremely humid environment will have very high moisture contents. In some freshly sawn pieces, moisture could account for over half of the wood’s total weight! Likewise, wood that has been stored in extremely dry conditions of less than 25% relative humidity will most likely feel lighter than average. Taking into account the size of the board, how does its weight compare to other benchmark woods? Is it heavier than Oak? Is it lighter than Pine? Look at the weight numbers for a few wood species that are close to yours, and get a ballpark estimate of its weight.
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.
Fir is most often used for building; however, it is inexpensive and can be used for some furniture-making as well. It does not have the most interesting grain pattern and does not take stain very well, so it is best to use it only when you intend to paint the finished product. Douglas fir is moderately strong and hard for a softwood, rating 4 on a scale of 1 to 4. This wood is worth mentioning because it is very common at your local home center and it is so inexpensive you will probably be tempted to make something with it. Pine comes in several varieties, including Ponderosa, Sugar, White, and Yellow, and all of them make great furniture. In some areas of the country (especially southwest United States), pine is the wood to use.
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