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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS785
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: uncertain of actual sample chemistry
FORMULA_HTML: uncertain of actual sample chemistry
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 bright yellow.
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 absorption edge centered at about 0.53 microns where reflectance drops from nearly 65% to 1% in a broad visible absorption centered at 0.471 microns. The NIR has many diagnostic vibrations forming a series of sharp absorptions of variable strength. There are five main regions of with vibrational complexes centered at 1.14, 1.37, 1.67, 2.16, and 2.26 microns. Individual absorptions are centered at: 1.115, 1.140, 1.182, 1.350, 1.394, 1.423, 1.448, 1.642, 1.682, 1.723, 1.786, 1.834, 1.883, 2.140, 2.261, 2.332, 2.372, 2.388, 2.414, and 2.451 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