http://inspire.ec.europa.eu/codelist/CommodityCodeValue/whiteFiringClayINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 18:08 PM CEST2015-08-18 18:08 PM CESTwhite-firing clayA clay that imparts whiteness to the finished ceramic ware when fired. - http://www.britannica.com/EBchecked/topic/642810/whiteware