 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.Forgeries in which modern lead or white lead pigment has been used can be recognized by using a technique called Pb(Lead)-210-Dating.Pb-210 is a naturally occurring radioactive isotope of lead that is part of the uranium-238 Radioactive decay series, and has a half-life of 22.3 years.