The Bai people usually make blue dye from a plant.

白族人通常用一种植物制作蓝色染料。

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The blue dye is obtained from the indigo plant.

蓝色染料是从靛蓝植物中提取的。

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I may even add a dab of blue dye on them, to make them look more like a bluegill.

我甚至会在他们身上加少许的蓝色，以便他们看起来更像一条太阳鱼。

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The gloomy conditions were at least illuminated by the respective strips with Harlequins' light blue, magenta, chocolate and French grey quartered shirt for once outshone by Stade's pink and blue tie-dye effort.

BBC: Harlequins 19-17 Stade Francais

At first Amgen tried using genetic engineering to create organisms that would extract oil from shale, man-made proteins that would make chickens grow faster and new specialty chemicals such as a cloned indigo, a substitute for the natural dye used to color blue jeans.

FORBES: Biotech Behemoth

Skipper William Porterfield led the way with a funky cut and dye, while coach Phil Simmons had his head shaved and is also sporting a blue goatee.

BBC: Cricket World Cup: Short, back and wides for Ireland