Indigofera tinctoria, also called true indigo, is a species of plant from the bean family that was one of the original sources of indigo dye
True indigo is a shrub 1–2 metres (3 ft 3 in – 6 ft 7 in) high. It may be an annual, biennial, or perennial, depending on the climate in which it is grown. It has light green pinnate leaves and sheafs of pink or violet flowers
It has been naturalized to tropical and temperate Asia, as well as parts of Africa, but its native habitat is unknown since it has been in cultivation worldwide for many centuries
The plant is a legume, so it is rotated into fields to improve the soil in the same way that other legume crops such as alfalfa and beans are. The plant is also widely grown as a soil-improving groundcover
Dye is obtained from the processing of the plant’s leaves. They are soaked in water and fermented in order to convert the glycoside indican naturally present in the plant to the blue dye indigotin. The precipitate from the fermented leaf solution is mixed with a strong base such as lye
Today most dye is synthetic, but natural dye from I. tinctoria is still available, marketed as natural colouring where it is known as tarum in Indonesia and nila in Malaysia. In Iran and areas of the former Soviet Union it is known as basma
لوبیا نیل (ایندیگو فرا) گونه ای گرمسیری از لوبیا است که بومی مناطق گرمسیری است.
ایندیگو به معنالی رنگ آبی نیلی است. و این اسم بخاطر رنگ آبی نیلی است که از برگهای این گیاه تولید میشود.
برگها را تخمیر میکنند و یک رنگ نیلی زیبا تولید میشود که در نقاشی با قلمو (باب راس 🙂 و رنگ آمیزی کاربرد دارد.
دانه های این لوبیا کوچک گرد و زرد کرمی رنگ است.
گیاهی بسیار مقاوم است که به نوع خاک حساس نیست و بسیار مقاوم است.