Things You'll Need
2 tablespoons salt
Spray bottle
Instructions
1
Dissolve 2 tablespoons of salt into a pint of warm water. Then put the salt water in a spray bottle.
2
Take the metal object outside.
3
Spray the metal object with the salt water until it is covered.
4
Leave the metal object outside and spray with the saltwater daily until it has acquired the desired patina.
http://www.ehow.com/how_8421623_turn-metal-rusty.html