PO 73 – pyrrole orange PO 73 – pyrrole orange Poor lightfastness Manufacturer/ product code: Kremer / 23178Chemical Description: diketo-pyrrolo-pyrroleColor: orangeColor Index: PO 73Date: from 1984 Reflectance Spectroscopy (350-950 nm) Reflectance Spectroscopy (200-1250 nm) Reflectance Spectroscopy (950-1700 nm) XRF Spectroscopy Raman Spectroscopy (532 nm) Raman Spectroscopy (785 nm) Raman Spectroscopy (830 nm) Raman Spectroscopy (1064 nm) FTIR Spectroscopy (non-invasive )