Because gold is soft, your tooth should leave a visible dent.
It depends on what metals the coin is made from!
IF your coin is a common-date coin, pour some baking powder into a bowl put your coins in it then add some quantity of water.......... after 15 mins your coins will look shiny and newBUT NEVER, EVER DO THIS WITH A VALUABLE COIN!!! Cleaning will affect the surface and accelerate any deterioration that already exists.
Yes. Friction is the resistance between an object and the surface in which it is. When pushing the coin, an opposite force is pushing it the other way, because the forcce you apply to the coin is greater it moves but that doesn´t mean there is no friction.
Gold plating essentially destroys the coin. While it might be technically possible, it would be destroying the details of your coin, especially if unprofessionally done. Cleaning coins also destroys the coin too.
As light changes from one medium to another, it changes speed and bends. This is called refraction. The light rays actually slow down when going down when going from the air to the water. This means that the coin looks like it is in a different location than it actually is.
Yes. An authentic 1862 $5.00 U.S. coin is a gold coin.
The best thing to do is take it to a coin dealer.
If you are talking about an oversized coin as in a large replica, the answer will most likely be no one. Unless your coin is an authentic coin, it has no collector demand and you'd be best off to sell it on eBay or a garage sale as a curiosity. Naturally, a coin dealer will buy authentic coins, but will not buy replicas.
You can go to your local magic shop or purchace it online at ellusionist.
Take it to a reputable coin dealer who should be able to tell you if you have an authentic pattern coin. Most pattern coins are not authentic and therefore numismatically worthless. But if you have a real one it can be worth quite a bit.
In general there is no such thing as an "authentic" two-headed coin. Since "Heads" and "Tails" are stamped at the same time on a stamping press that has different dies for the top and bottom, it's almost certainly a "manufactured" coin. If it's done right, it can be difficult to detect the seam.
7-1-11>>> This is not a US Mint error coin. It's a novelty or magician's coin with no numismatic value.
Most likely it is real. However to be sure just take it to your local coin collector.
Please look at the coin again. No authentic 1816 U.S. one dollar coins exist.
The piece is not authentic, but a coin dealer may be interested in it.
The coin would float.
A person would have to submit their coin to an authentication service. Then the service would prove if the coin is real or not and give a proof of authenticity if the coin was authentic.