Using oxidation to bring out the design of a piece of jewelry is a very common practice in the jewelry world. However, many of these finishes are achieved with chemical patinas, whose safety is often questionable. If you’re looking for an alternative and natural way to oxidize your  pieces, look no further! You can use egg yolks to achieve a darkened finish on your silver jewelry. (Note: this technique does NOT work on fine silver but is effective on sterling silver, copper and bronze).

1. Boil an Egg. Use two if you are working with alot of metal.

2. Put the yellows (yolks) into a plastic food storage container, or into a bowl that can be easily sealed. Break them up a bit.

3. Put a wire rack over the egg yolks to hold your jewelry above the eggs. If you don’t have a wire rack, use some paper toweling to keep the egg from touching the silver. Anywhere egg touches, it will oxidize faster, and unevenly.

4. Put your jewelry in the container and seal it. Leave it for a day, then check it If not dark enough, leave it for another day or two.

5. Remove the jewelry and wash it with a gentle soap.

6. Use a buffing cloth to bring the high points on the piece back to a bright shine. Cheap, quick and easy!

Source: WikiHow