DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS800
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: likely Cr2O3*2H2O
FORMULA_HTML: likely Cr2O3*2H2O
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 greenish-blue.
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 double reflectance peaks centered at 0.377 and 0.511 microns with an intervening absorption at 0.436 microns and a boardering broad absorption at 0.632 microns with a weak shoulder at 0.710 microns. There are a number of relatively weak vibrational absorptions at 1.445, 1.794, 1.883, 1.920, 2.001, 2.176, 2.281, and 2.403 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