This is an inquiry message about "化学染料（tanning chemicals）" from Latest Technologies Engineering Group.
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其主要想法是合成化学染料代替纺织染料。
The main idea here is that synthetic chemical dyes replaced textile dyes.
在19世纪发现化学染料之前，靛蓝一直被高度重视。
The indigo plant was highly valued until the discovery of chemical dyes in the 19th century.
在合成化学染料出现之前，诸如靛蓝之类的纺织染料主要来源于植物。
Textile dyes, such as indigo, were mostly of plant origin until the advent of synthetic chemical dyes.
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