What is Fire Scale?




Fire scale is the term used to describe a smokey brown coloured mark which sometimes appears on sterling silver while the metal is being worked on at very high temperatures.  A good example is when a piece of sterling silver jewellery is being soldered in order to attach the bale to the top of a gemstone pendant.  Fire scale looks like a tea stain and is caused because of a reaction between oxygen in the atmosphere and the copper alloy that's present in the silver.




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