he discoloration is caused by the production of the pigment xylindein, which is classified by chemists as a napthaquinone. This pigment exists in several different forms of various colors within the wood cells; the combination of a yellow-orange form with a blue-green form results in the dazzling blue-green coloration of the colonized wood. Xylindein can inhibit plant germination and has been tested as an algaecide. It may make wood less appealing to termites, and has been studied for its cancer-fighting properties.