Bringing half coins out
Now with the help of a spoon, carefully take half of the coins out of the bowl and place them over the piece of cloth.
Getting other coins out and rinsing
After that get the other coins out of the bowl and try to rinse them thoroughly. Put them on a separate piece of cloth and not with the coins you brought out of the bowl earlier.
The rinsed one shine
Leaving the two sets of coins for about an hour, you will see that rinsed coins are bright and new looking as compared to those which were not rinsed. This is because rinsing the coins washes away a compound called Malachite that forms a coating on dark coins.