STUDY ON THE FORMATION OF BLACK PATINA ON BRONZE MIRRORS INDUCED BY HUMIC ACID

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The black patina on some ancient Chinese bronze mirrors is known as "Black Lacquer Antique"(BLA) or "Hei-qi-qu", which looks jet-black and shiny. BLA’s were corroded slowly, one of them was about 10<sup>-4</sup>mm per year
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