Han van Meegeren knew that white lead was used during Vermeer's time, but of course he had to obtain his stocks through the modern colour trade, which had changed significantly since the 17th century. During Vermeer's time, Dutch lead was mined from deposits located in the Low Countries; however, by the 19th century, most lead was imported from Australia and the Americas, and differed from the white lead that Vermeer would have used both in the isotope composition of the lead and in the content of trace elements found in the ores. Dutch white lead was extracted from ores containing high levels of trace elements of silver and antimony, while the modern white lead used by Van Meegeren contained neither silver nor antimony, as those elements are separated from the lead during the modern smelting process.