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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS807
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: ZnO
FORMULA_HTML: ZnO
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 white.
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 electronic absorption edge where the reflectance drops from nearly 80% to nearly 3%. The absorption edge is centered at about 0.39 microns. From 0.6 to 2.5 microns the spectrum slopes monotonically downward with just a few minor vibrational absorption probably due to adsorbed water and/or trace contaminants. These vibrational absorptions are located at 1.392, 1.435,1.392, 1.884, 1.986, 2.272, and 2.414 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