bice
/baɪs/noun
mass noun
- dated a medium blue or blue-green pigment made from basic copper carbonate〈旧〉（用碱式碳酸铜制成的）中度蓝色（或蓝绿色）颜料。
词源
Middle English （originally in the sense 'dark or brownish grey'）： from Old French bis 'dark grey', of unknown ultimate origin.