| Section: 6 | Minerals and pigments (MP) | Page: 46 | 
| IRUG filename: RMP00046 | Data type: Raman | IRUG material class: Minerals and pigments (MP) | 
| Sample type: Reference material | Common name(s): Realgar mineral, coarse, Pigment Yellow 39 (PY39), CI77085 | Chemical/botanical name(s): Arsenic sulfide | 
| CAS name: 2,4,6,8-Tetrathia-1,3,5,7-tetraarsatricyclo[3.3.0.03,7]octane | Sample source 1: Forbes Pigment Collection, Harvard University Art Museum | Source location 1: 32 Quincy St, Cambridge, MA, 02138, USA | 
| Sample source 2: Forbes Pigment Collection, Museum of Fine Arts, Boston | Source location 2: 465 Huntington Avenue, Boston, MA, 02115, USA | Sample identifier 2: MFA 212 | 
| Color: Orange, medium, opaque | Application: Raman microscopy/microspectroscopy | Excitation source (nm): 785 | 
| Mode: Scat | Originating institution name: Museum of Fine Arts, Boston | Originating institution acronym: MFAB | 
| Molecular formula: As4 S4 | Linear formula: As4S4 | CAS registry no: 12279-90-2 | 
| Other analytical methods: XRD (x-ray diffraction), XRF (x-ray fluorescence), SEM (scanning electron microscopy) |