boneblack meaning in Chinese

骨炭〔一种漂白剂〕。

He found that the red pigment proved to be iron oxide , hematite ; a yellow consisted of clay containing iron or yellow ochre ; a blue color was a finely powdered glass ; and a pale blue was a copper carbonate , probably azurite ; green were malachite ; black was charcoal or boneblack ; gray , a limestone mixed with charcoal ; and a quantity of pigment remaining in a paint pot used in the decoration , contained a mixture of hematite with limestone and clay
他发现红颜料是铁的氧化物赤铁矿；黄色颜料由含有铁或黄赭色粘土组成；蓝颜色为细微的玻璃粉；而普蓝就是碳酸铜，或许是蓝铜矿；绿颜料为孔雀石；黑色为木炭或骨黑；灰色，石灰石混合木炭而成；而一些颜料残留在用于彩绘装饰的颜料瓶里，含有赤铁矿与石灰石及粘土的混合物。