PB 66 – synthetic indigo PB 66 – synthetic indigo First indigo synthesis dates back to 1882 but it was commercially produced from 1901 Manufacturer/ product code: Kremer / 36009Chemical Description: synthetic indigoColor: blueColor Index: PB 66Date: from 1882 Reflectance Spectroscopy (350-950 nm) Reflectance Spectroscopy (200-1250 nm) Reflectance Spectroscopy (950-1700 nm) XRF Spectroscopy Raman Spectroscopy (785 nm) Raman Spectroscopy (830 nm) Raman Spectroscopy (1064 nm) FTIR Spectroscopy (non-invasive )