https://w3id.org/np/RAGc2SwaCL... RAGc2SwaCL

links a nanopublication to its assertion http://www.nanopub.org/nschema#hasAssertion assertion

http://www.w3.org/1999/02/22-rdf-syntax-ns#type type

http://purl.org/dc/dcmitype/Dataset Dataset

Alessa An Gambardella

2024-04-11T15:18:02.306Z

https://w3id.org/np/RAGc2SwaCL... RAGc2SwaCL

links a nanopublication to its assertion http://www.nanopub.org/nschema#hasAssertion assertion

http://purl.org/dc/terms/description description

Ultramarine blue pigment from lapis lazuli is one of the most valued natural artist’s pigments used throughout history for its brilliant hue. Historical recipes describe various pigment preparation methods, however, little is understood about why such treatments were performed or how to distinguish them a posteriori on historical paintings. One such historically relevant treatment is heating of the lapis lazuli rock prior to extracting lazurite. X-ray absorption near-edge structure spectroscopy (XANES) at the sulfur K-edge in microbeam and full-field modes (analyzed with non-negative matrix factorization, NMF) is employed to monitor the changes in the sulfur species within lazurite following treatments. Sulfur signatures in lazurite show dependence on the heat-treatment of lapis lazuli rock from which it is derived. In particular, peaks at 2469.0 and 2471.2 eV, attributed to contributions from the trisulfur radical (S3•⁃), which is responsible for the blue color of lazurite, increase in relative intensity with heat of treatment ≥ 600 °C, paralleled by an intensified blue hue. The peak at 2472.5 eV (presumed as S8), on the other hand, decreases in relative intensity. The sulfur signature following heat-treatment is not only unique but also retained following accelerated aging of each pigment mixed as a paint with linseed oil. Further, XANES spectra using an attenuated focused microbeam were gathered on lazurite particles from five historical paint samples. In each, profiles matching that of pigment derived from heat-treated rock were identified, providing a marker for artists’ pigments that had been extracted from heat-treated lapis lazuli.

Alessa An Gambardella

2024-04-11T15:18:02.306Z

https://w3id.org/np/RAGc2SwaCL... RAGc2SwaCL

links a nanopublication to its assertion http://www.nanopub.org/nschema#hasAssertion assertion

http://purl.org/dc/terms/title title

Sulfur K-edge Micro- and Full-field XANES Identifies Marker for Preparation Method of Ultramarine Pigment from Lapis Lazuli in Historical Paints

Alessa An Gambardella

2024-04-11T15:18:02.306Z

https://w3id.org/np/RAGc2SwaCL... RAGc2SwaCL

links a nanopublication to its assertion http://www.nanopub.org/nschema#hasAssertion assertion

http://purl.org/dc/terms/publisher publisher

https://ror.org/02550n020 02550n020

Alessa An Gambardella

2024-04-11T15:18:02.306Z