From time immemorial to gold, is the most precious metal of all time, but there is no scientific reason for this, but many believe that because of the color of that metal, which is close to the yellow color (not full yellowing by the invention of a new color called golden color and Is not the yellow color known to all degrees).
Gold is similar to other metals such as copper, and some may wonder how I can distinguish original gold from other imitated gold or copper.
The fact that there are some methods and expertise to test gold, but to make sure that your hands are gold must be taken to the special laboratories.
Do not worry when you buy gold jewelry from famous shops, you take an invoice to confirm that what you bought gold is real, there is a stamp of gold to distinguish him from other metals, but always make sure to buy gold jewelry from the famous shops with an invoice purchased.
There are some ways to check gold, but as we have said, it does not dispense with careful examination in private laboratories. It is simple to test softness. Gold is soft metal so that strong pressure on the finger affects the gold surface. Gold also reacts with mercury and changes color. Be careful to keep gold away from thermometers, for example, they contain mercury.
If it is curious for you, them take the mercury density number from the periodic table of the elements and perform weight tests with sensitive scales to ensure the purity of the gold, but the gold that is subject to that experiment should not contain stones because it will affect the density .
The density standard mentioned above is great. Gold is very dense, and most of the metals that can be cheated by gold are less than dense, so the counterfeit can be detected immediately.