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Blue gold

 

Hi Marc,
Blue gold is a special 21k gold and iron alloy that was developed by the Geneva jeweler Ludwig Muller. Because of the iron portion of the metal it can be blued by heat treatment similarly to the bluing of steel screws. The iridescent blue layer thus formed on the highly reflective polished gold surface is very striking.
(from my report to a visit to Andersens shop: ahci.watchprosite.com )

I don't know of anyone else who uses it.
Don

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