關於「Indigo dye」標籤，搜尋引擎有相關的訊息討論：

Quality blues: traditional knowledge used for natural indigo ... - NCBIwww.ncbi.nlm.nih.gov › pmc › articles › PMC8028174Indigo | C16H10N2O2 - PubChempubchem.ncbi.nlm.nih.gov › compound › IndigoThe Link Between Japanese Samurai and Real Indigo - YouTubewww.youtube.com › watchMa