indigo dye meaning in English

靛类染料
靛青染料

Indigo dyed cotton yarn
棉纱染料靛青
The development of an indigo dye gave these pants their famous blue color
在发展出深蓝色染料后，深蓝色成为牛仔裤的注册商标。
Dyeing and finishing technologies such as new coloration and finishing technologies , electrolytic indigo dye reduction system and plasma surface treatment system ; and
染整技术，如新染整技术、电解还原靛蓝染料技术及等离子表面处理系统；以及