black iron oxide ; aethiops martialis
四氧化三铁/磁性氧化铁/黑色氧化铁/磁铁矿/氧化正亚铁/精磁铁砂/氧化铁黑/Ferrosoferric oxide 碱性蛋白酶/Alkaline proteinase ..
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系统产生的黑色沉淀物主要由硫化铁和氧化铁构成；
The black deposits produced in the system were mainly composed of iron sulphide and iron oxide.
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绝对黑色镜片在常规制作镜片过程中加入氧化铅和氧化铁一起熔炼而制成。
Said absolutely black lens is made up by addition of lead oxide and iron oxide during its manufacture.
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