noun
natural indigo
Refers to indigo dye derived from plants, as opposed to synthetic indigo. Used in contexts like traditional dyeing and textiles.
この着物は天然藍で染められています。
This kimono is dyed with natural indigo.
藍 is the general term for indigo (plant or color), while 天然藍 specifically emphasizes that it is natural, not synthetic.
Compound of 天然 (natural) and 藍 (indigo).