noun
synthetic indigo
Refers to indigo dye produced artificially rather than from natural indigo plants. Used in contexts of dyeing, textiles, and chemistry.
このジーンズは人造藍で染められています。
These jeans are dyed with synthetic indigo.
天然藍 is natural indigo from plants, while 人造藍 is synthetic indigo produced chemically.
Compound of 人造 (じんぞう, 'artificial, man-made') and 藍 (あい, 'indigo').