[英中] 請問一下這一句

[myler ()]

（A company）...becomes renowned for starch,
washing blue and black for polishing.


請問一下這句是什麼意思呢？
blue and black不是瘀青的意思嗎?
可是在這句用這樣翻好像怪怪的....

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推 spacedunce5:我覺得是starch, washing blue, and black for . . .