Bitten And Restored Coin Trick
David Blaine performed this very effective trick where a coin was bitten and a piece torn off.
The coin was restored when the missing piece was seemingly spat out at it.
This trick was performed using a very
cleverly engineered coin similar to the one in the picture which is available from good magic suppliers and is switched for the spectators coin.
You can do your own version of the trick by making your own trick coin by looking at the coin trick section of this site. Otherwise there is the professional version available which can be viewed by clicking the above link.
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cleverly engineered coin