PR 274 – ponceau 4R PR 274 – ponceau 4R Manufacturer/ product code: Kremer / 42300Chemical Description: cerium sulfideColor: redColor Index: PR 274Date: — 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 )