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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS793
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: ground Pb-Sn glass
FORMULA_HTML: ground Pb-Sn glass
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 light 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 sigmoidally shaped electronic absorption edge where reflectance drops from 70% to nearly 3% in the visible forming a strong absorption centered at 0.48 microns. The upper part of the sigmoid is formed by an absorption centered at 0.532 microns. There is a very broad electronic? absorption centered at 1.752 microns with subsidiary vibrational? bands at 1.445 and 2.001 microns. Weaker vibrational absorptions are also present at 2.241 and 2.320 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