The worker is dyeing cloth in a VAT.

工人正在一个大桶里染布。

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Around this time, he introduced some new techniques for dyeing cloth.

在此前后，他引进一些用于染布的新技术。

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For the printing and dyeing cloth manufacturers and manufacturers to provide first-class products and the best services.

能为各布匹生产厂家及印染厂家提供一流的产品和最佳的服务。

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So, practitioners who understood what we would know to be chemistry were highly valued in that society. And then, you may expand it to other chemical processes, dyeing of cloth, glassmaking, and metals extraction.

所以，理解我们所知为化学的,先行者们，在那个社会是,非常宝贵的，当时，你可能将其扩展到另一个化学过程，如布料的染色，玻璃的制造，还有金属提取。

麻省理工公开课 - 固态化学导论课程节选

In the Middle Ages it was discovered to be a rich source of aluminium sulphate - a crucial raw material used as a fixing agent in dyeing cloth.

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