6,6'-Dibromoindigo (CAS# 19201-53-7) is a useful research chemical compound. It is pigments prepared by reacting palygorskite with natural or synthetic dyes. It was found in royal purple dyed textile from Timna valley (Israel).
参考文献
Biersack, B. M., Koedel, J. F.: Ger. Offen., 10pp., (2021); Sukenik, N., et al.: PLoS One, 16, 0245897 (2021);