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Section: 9 Organic dyes and pigments (OD) Page: 175

 Copyright © 1993-2024 Infrared and Raman Users Group (IRUG)


Details

IRUG filename:
IOD00175
Data type:
Infrared
IRUG material class:
Organic dyes and pigments (OD)
Sample type:
Reference material
Common name(s):
Indigo carmine, from plant indigo, Natural Blue 2, CI75781
CAS name:
1H-​Indole-​5-​sulfonic acid, 2-​(1,​3-​dihydro-​3-​oxo-​5-​sulfo-​2H-​indol-​2-​ylidene)​-​2,​3-​dihydro-​3-​oxo-​, sodium salt (1:2)
Sample source 1:
Helmut Schweppe Collection of Early Synthetic Dyes
Source location 1:
BASF, Ludwigshafen, Germany
Sample identifier 1:
Indigo carmine
Sample source 2:
Getty Conservation Institute
Source location 2:
The Getty Center, 1200 Getty Center Drive, Los Angeles, CA, 90049
Sample identifier 2:
Indigo carmine
Age:
1986, acquired
Application:
DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy)
Mode:
Refl
Originating institution name:
Getty Conservation Institute
Originating institution acronym:
GCI
Molecular formula:
C16 H8 N2 O8 S2 * 2 Na
CAS registry no:
860-22-0