Utilising the cheap and plentiful coal tar that was an almost unlimited byproduct of London's gas street lighting, the dye works began producing the world's first synthetically dyed material in 1857.
2
在这一过程中，N-二甲基甲酰胺是其副产物。
During the process, N- dimethyl methanamide is coproduct.
3
结果发现，这些棕色污点含有真菌代谢的副产物——黑色素。
It turns out that the brown marks contain melanins - byproducts of fungus metabolism.
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