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you have to get 100% on the practice questions. 1 gold bar=100% on a catergorie
For one thing, no circulating pennies anywhere were ever made of gold, apart from some printed in Ancient Rome, which are antiques and rare to find today. If your friend doesn't believe that, you can buy a relatively cheap home gold testing kit. The kit consists of an acid used to detect gold and special magnet. The more expensive versions, which are designed for experts rather than amateurs, may also include digital scales, acids for silver and platinum as well as gold and a small sample of a gold nugget to practice with. You'll find these online in places such as Amazon.
By studying the displacement of water caused by pure gold and silver of the same mass, he proved that the gold crown was not of pure gold as claimed by the jeweller.
Take it to see Money Mart, they can test it or find a gold test kit
A 375 marking is a gold marking; it indicates 9K gold. You can find this by multiplying .375 by 24 (since there are 24 karats in pure gold). Visit the link below for more details about gold markings.