| Section: 9 | Organic dyes and pigments (OD) | Page: 171 | 
| IRUG filename: IOD00171 | Data type: Infrared | IRUG material class: Organic dyes and pigments (OD) | 
| Sample type: Reference material | Common name(s): Naturindigo, middle, Java, Natural Blue 1, CI75790 | CAS name: 3H-Indol-3-one, 2-(1,3-dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro- | 
| Sample source 1: Helmut Schweppe Collection of Early Synthetic Dyes | Source location 1: BASF, Ludwigshafen, Germany | Sample source 2: Getty Conservation Institute | 
| Source location 2: The Getty Center, 1200 Getty Center Drive, Los Angeles, CA, 90049 | Age: 1986, acquired | Application: DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy) | 
| Mode: Refl | Cross reference to additional spectra: UV/VIS spectroscopy | Originating institution name: Getty Conservation Institute | 
| Originating institution acronym: GCI | CAS registry no: 482-89-3 |