Instead of a 10-ounce ingot, I cast a two-kilogram (4.4-pound) fake the size of a Twinkie cake. A Twinkie heavier than four pounds? Yes, gold is dense, much denser even than lead. Good forgeries must have the right weight, and there is only one element as dense as gold that's neither radioactive nor expensive. That's tungsten, which can cost less than $50 a pound.