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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS799
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: likely C32H16CuN8
FORMULA_HTML: likely C32H16CuN8
COLLECTION_LOCALITY: Phillips Collection, Washington, D.C
ORIGINAL_DONOR: Patricia Favero
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
SAMPLE_DESCRIPTION:
Dry powdered paint pigment from Kremer Pigments Inc.
Visual examination in sunlight indicates this sample is deep blue.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
This pigment has a strong reflectance peak centered at 0.46 microns and a broad nearly flat bottomed absorption complex that stretches from 0.46 to 1.0 microns centered at 0.68 microns. Positions of absorptions and number of absorptions in absorption complexes with overlapping bands are approximate, and would require deconvolution to determine the actual number and position of absorptions. Numerous vibrational absorptions dominate the NIR portion of the spectrum. Individual absorptions are centered at: 0.929, 1.024, 1.106, 1.679, 1.775, 1.832, 2.148, 2.211, 2.270, 2.274, 2.345, 2.378, 2.416, and 2.468 microns (continuum removed positions). G. Swayze
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns