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 In Techniques

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What makes this wood so special? Fungus.

If there’s one wood that can really challenge your sense of design—and your woodworking skills—it’s spalted maple. Those inky black lines can both delight the eye and drive you crazy.

Spalted maple is just ordinary maple that’s partly rotten. After the wood is cut, different colonies of stain, mold and decay fungi attack it and establish boundaries to preserve their turf. That’s what those black lines are—borders between warring tribes. They don’t follow any regular pattern, such as the tree’s growth rings. Their abstract nature teases the eye, drawing you in and making the wood fascinating to look at.

Those lines can change in unpredictable ways inside the wood. You may have the perfect pattern picked out on a board, only to have it change drastically—or disappear—with one pass through the planer. Working spalted maple is like carefully excavating an archaeological site: You have to know when to stop digging.

The fungi colonies may also alter the color of the wood they’re feasting on.


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