The cobalt (nickel and iron) oxide, and cobalt silicate in the slag are from the arsenic elimination of cobalt compounds by completely oxidization and consequently slagging process.
渣块中的钴(镍铁)氧化物、钴的硅酸盐则是由完全脱去砷的钴氧化及氧化后造渣而形成。
However, scientific test has confirmed that the colorant used is iron oxide and not cobalt.
然而，科学实验证实，该着色剂是铁氧化物和不使用钴。
However, scientific test has confirmed that the colorant used is iron oxide and not cobalt.
然而，科学实验证实，该着色剂是铁氧化物和不使用钴。
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