Boron, arsenic, and antimony, among other substances, are used as dopants when added to a pure semiconductor material to alter its electrical characteristics.
Artificially produced gemstones[?] (such as Ruby (gemstone)) usually contain a dopant to identify them as such.
... from the New Testament.
His life is no doubt fitly characterized by the words
under an old picture first referred to by
Francescus Tolensis[?]: "In all things I ...