DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS811
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: Manganese oxide, iron hydroxide as UV to NIR active phases
FORMULA_HTML: Manganese oxide, iron hydroxide as UV to NIR active phases
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 dark earthy brown.
Image is very dark and was collected under lighting conditions identical to that used to photograph the other paint pigments in this chapter.
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 weak absorptions at 0.484, 0.728, and 0.947 microns superimposed on an otherwise monotonously increasing spectral slope into the near-infrared. A weak absorption at 1.914 microns is probably due to adsorbed water (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