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Oxidizing Copper with Eggs

I do a lot of work in copper and I go back and forth between liking it most in its natural shiny state and adding a patina to it so it looks darker and aged.

A lot of artists use liver of sulphur to add patina, but I don't have a source close by and I really didn't want the odor and fumes in my house. I don't have a separate shop with a ventilation system so I looked into alternative methods. After much research and discussion on various forums I decided to give the egg method a try.

Hard boil and egg and while it is still warm, cut it in a couple of pieces and put it in an airtight container with your item. I have read people stating to not let the egg touch the item, but my egg and item always get jumbled together and I never found it to be a problem. In fact, when I was using the egg method on an item with a very tight weave just leaving it sitting with the egg wasn't working very well so I squished the egg into the piece. I use a ziploc bag to do this so I can keep moving and turning the item to get good coverage.

This method takes quite a bit longer then using liver of sulphur, but it gives you more control. In fact, most of my pieces get left in the egg overnight.

Images

Copper Bracelet After Oxidizing With Eggs
Copper Bracelet After Oxidizing With Eggs

Contributed by Morning Sky on February 23, 2008, at 9:41 AM UTC.

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