I wanted to share a method I have found for cleaning Ottoman low silver, that is silver which is 30-40% real silver content. Many Ottoman jewels were made entirely or partially in this lower silver content. For example, the buckle I will share has the filigree top in high silver, and the frame and chain/pin closure in the low silver. However unlike a lot of supposed low silver which is not silver at all but nickel or tin, the Ottoman low silver pieces will have 30-40% silver content and can be beautifully cleaned. I have tested this silver and it shows as a pale green/yellow on nitric acid. For comparison 50% silver is listed on the chart as pale green.
When Ottoman low silver is heavily tarnished, it will look like tarnished brass. It is impossible to remove the tarnish with silver cloth or paste at this stage, which leads many to conclude that it is brass, but it is not. Here is an example of the cleaned low silver pin against the still-tarnished low silver frame. You can see the frame looks just like tarnished, dull brass.
To polish this silver, you need a two-step process. The first treats the metal like brass, and the second like silver. The first step is to clean in acid. I have used vinegar and ketchup with success. You apply acid to the piece, just like brass, but when the tarnish comes off instead of being yellow the metal will be silvery white. Between 30-90 minutes should work, depending on how heavy the tarnish is. Here is an example of the chain after acid cleaning.
After the acid cleaning, you can use silver polish cloth or paste or even chemical on the piece and it will turn a brilliant shiny white. Here is a comparison of the pin, which has been cleaned with acid and then polished with a silver cloth, on top of the high silver filigree, which has been gently cleaned with cloth.
I hope this is useful. While this method reduces the patina, I prefer the silver look vs. metal that appears to be tarnished brass. There have been multiple Ottoman and Bulgarian photos posted here cited as brass, where I suspect the metal is really this 30-40% silver.
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