How to Make Convincing Fake-Gold Bars
Posted 03.14.2008
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On Wednesday,
the BBC reported that millions of dollars in gold at the central bank of Ethiopia has turned out to be fake: What were supposed to be bars of solid gold turned out to be nothing more than gold-plated steel. They tried to sell the stuff to South Africa and it was sent back when the South Africans noticed this little problem.
The problem with making good-quality fake gold is that gold is remarkably dense. It's almost twice the density of lead, and two-and-a-half times more dense than steel. You don't usually notice this because small gold rings and the like don't weigh enough to make it obvious, but if you've ever held a larger bar of gold, it's absolutely unmistakable: The stuff is very, very heavy.
The problem is, anyone who so much as picked up one of these bars should have known immediately that they were fake, no fancy test required. The weight alone is an instant dead giveaway. Even a forklift operator lifting a palette full of them should have noticed that his machine wasn't working hard enough. I think they must have been swapped out while in storage: Someone walked in each day with a new fake gold bar and walked out with a real one. If they were fake on arrival then everyone who handled them in any way must have either had no experience with gold or been in on the scam.
The first exception is depleted uranium, which is cheap if you're a government, but hard for individuals to get. It's also radioactive, which could be a bit of an issue. The second exception is a real winner: tungsten. Tungsten is vastly cheaper than gold (maybe $30 dollars a pound compared to $12,000 a pound for gold right now). And remarkably, it has
exactly the same density as gold, to three decimal places. The main differences are that it's the wrong color, and that it's much, much harder than gold. (Very pure gold is quite soft, you can dent it with a fingernail.)
A top-of-the-line fake gold bar should match the color, surface hardness, density, chemical, and nuclear properties of gold perfectly. To do this, you could could start with a tungsten slug about 1/8-inch smaller in each dimension than the gold bar you want, then cast a 1/16-inch layer of real pure gold all around it.
Such a top-quality fake London good delivery bar would cost about $50,000 to produce because it's got a lot of real gold in it, but you'd still make a nice profit considering that a real one is worth closer to $400,000.
Edited by Rogerdodger, 25 August 2008 - 05:52 PM.