In ancient times, alchemists phantisized about changing worthless metals into gold.  
 
Now you can bring that phantasy to life.  Sandwich a silver coin between two coppers, it changes to copper.  Sandwich a copper coin between two silvers, and it changes to silver.  
 
For a finale, a silver coin magically changes into a gold coin in the spectator's hand.  The best part is that you end clean and all the coins can be examined.  
 
Some simple slight of hand is required, but all can be learned in a short time.  Excellent quality coins are supplied.