HaruthaiAi/TreeOil_SEM_Pigment_XRF_TaraAnalysis_2017

TreeOil Pigment SEM Analysis Dataset (TARA Lab, 2017)

This dataset contains 10 SEMQuant reports and 5 field photographs from the Tree Oil Painting pigment analysis session conducted by Dr. Sasiphan Kawirat (National Institute of Nuclear Technology, Thailand) at TARA BUSINESS lab in June 2017. The goal was to identify and verify elemental pigment composition and support scientific attribution of the Tree Oil Painting.

File Summary:

Sample 1 Red Brown

Sample 2 Ultramarine

Sample 6 Lead Yellow

Sample 7 Red Brown

Sample 8 Green

Sample A Yellow Point

Sample A Blue Point

Sample Red Ocher

Microscopy Photos (macro structure & SEM close-ups)

Lab Environment Photos (sampling, supervision, and lab equipment)

Methodology:

SEM Resolution: 72 eV (except Sample 2: 61 eV)

ZAF Quantitative Method (5–7 iterations)

Energy Dispersive X-ray Spectroscopy (EDX) elemental detection

Results normalized by weight % (Wt%) and atomic %

Main detected elements: Fe, Zn, Cr, Pb, Ba, Cu, Ca, Al, Si, C, O, Cl, Na, K, S, P

Description of Procedure:

The pigment samples were collected from the protruding color edges (not from painted surface) under the supervision of Dr. Sasiphan Kawirat. SEM/EDX analysis was conducted overnight across June 8–9, 2017. All samples exhibited aged mineral structure and unrefined crystalline pigment morphology, indicating non-synthetic historical composition.

Scientific Significance:

These spectra reveal high Zn (up to 36.4%), Pb (3.19%), Cr (up to 13.25%), and Fe (up to 37.95%) in specific samples, consistent with 19th-century red ochre, ultramarine, and lead-tin yellow formulations. Elemental ratios support hypotheses derived from XRF and FTIR datasets and align with period-correct pigment sourcing.

Use in AI Torque Validation:

The SEM data complements TorqueBrush stroke analysis by validating pigment types and matching expected optical scattering profiles in high-resolution imaging. The coarse crystal structures explain the torque irregularities found in TreeOil TorqueMap overlays.

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Prepared by: Haruthai Muangbunsri & AI Sunny Date: May 2025