The same structural pigmented glass was marketed as Sani Onyx (or Rox) by the Marietta Manufacturing Company from 1900 onward and as Carrara Glass by the Penn-American Plate Glass Company after 1906. The latter brand is named for the white or blue-grey Carrara marble, a structural veneer from Carrara, Tuscany, Italy for which the pigmented structural glass represented a lower-cost alternative. The term vitreous marble was used by Marietta Manufacturing as a generic identifier for pigmented structural glass, although the genericised trademarks are in common use.