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It is this compound that is responsible for the characteristic bluish-green stain of wood infected by this species, used today in decorative woodworking such as Tunbridge ware and parquetry. The use of this wood, known as “green oak”, goes back to 15th century Italy, where it was used in intarsia panels made by Fra Giovanni da Veroni
Nice! These are even more deserving of the name “elf cup”
I just found this on Wikipedia: