Before we delve into depletion gilding of silver, let’s talk about fine silver and sterling silver. Fine silver is 99.9% silver and it is soft. So soft that if jewellery was made from it, it would suffer more damage and wear and wouldn’t be able to be worn daily. That is why jewellery when silver is made out of sterling silver. Sterling silver (like the stamp) is 92.5% silver and the rest is another alloy; mostly copper.
Depletion gilding is the process of heating your sterling silver several times to bring the fine silver to the surface of the metal, creating a white satiny look. In between heating, you drop your piece in the pickle to remove oxides. This process is repeated several times to achieve the white satin look.
Van Mackenzie, White bean bracelet, 2012, sterling silver, depletion gilding.
Above is an example of what depletion gilding looks like.