The main idea here is that synthetic chemical dyes replaced textile dyes.

其主要想法是合成化学染料代替纺织染料。

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Textile dyes, such as indigo, were mostly of plant origin until the advent of synthetic chemical dyes.

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。

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Adopting pure natural substances and without synthetic chemical, the said health eggs have the functions of improving health.

由于本发明完全采用了天然物质，不用化学合成制剂，因而无毒，无副作用，具有保健、营养、强身之功效。

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Worried specifically about synthetic chemical pesticides?

FORBES: Bittman of the 'New York Times': Always Out To Lunch

The shift toward synthetic chemical medicines occurred in the 20th Century, but according to Mark Blumenthal, the founder and executive director of the American Botanical Council, there is renewed interest in the medicinal benefits of natural foods - including those found in the pills.

BBC: Plants found in ancient pills offer medicinal insight

This approach, which has been repeatedly condemned by the scientific community, has discouraged the development of new pest-resistant crops, encouraged greater use of synthetic chemical pesticides, and limited the use of the newest genetic engineering technology mainly to larger developers who can pay the inflated regulatory costs.

FORBES: EPA Biotech Regulation Bucks The Scientific Consensus