Shibuichi - the word means "one-fourth" in japanese, which refers to the proportions of one part silver to three parts copper. This clasp is from Green Girls Studio in shibuichi, cast in the alloy of copper and silver.
Because of the increased copper in the alloy, shibuichi has a lovely patina ability to grant great colors of blue and green. This toggle set is from Zoa Arts in shibuichi silver.
Posted by Lynn Davis, who loves to patina silver and copper.