Published June 18, 2024
| Version v1
UV/VIS/NIR Reflectance Spectroscopy
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Photoaging experiments on chrome yellow-based oil paint mock-ups
- 1. CNR-SCITEC
- 2. CNR-ISPC
- 3. Università degli Studi di Perugia - Dipartimento di Chimica, biologia e biotenologie
Description
Series of oil paint mock-ups exposed to UV-filtered light and monitored by using UV-Vis-NIR diffuse reflectance spectroscopy at different aging steps.
Samples/file names description
a) Pure pigments
- Sulfate-rich chrome yellow (folder name; CrY0.8-pure)
- Sulfate-free chrome yellow (folder name: CrY0-pure)
- emerald green (folder name: emerald green-pure)
- vermilion (folder name: vermilion-pure)
- red lead (folder name: red lead-pure)
- lead white (folder name: lead white-pure)
- zinc white (folder name: zinc white-pure)
b) Chrome yellow paints with admixed pigments in different weight ratio
- CrY0.8 : emerald green = 9:1 (folder name: CrY0.8-emerald green)
- CrY0 : emerald green = 9:1 (folder name: CrY0-emerald green)
- CrY0.8 : red lead = 9:1 (folder name: CrY0.8-red lead)
- CrY0 : red lead = 9:1 (folder name: CrY0-red lead)
- CrY0.8 : vermilion= 9:1 (folder name: CrY0.8-vermilion)
- CrY0 : vermilion = 9:1 (folder name: CrY0-vermilion)
- CrY0.8 : zinc white= 1:9 (folder name: CrY0.8-zinc white90)
- CrY0: zinc white = 1:9 (folder name: CrY0-zinc white90)
- CrY0.8 : zinc white= 1:1 (folder name: CrY0.8-zinc white50)
- CrY0: zinc white = 1:1 (folder name: CrY0-zinc white50)
- CrY0.8 : lead white (hydrocerussite)= 9:1 (folder name: CrY0.8-lead white10)
- CrY0: lead white (hydrocerussite)= 9:1 (folder name: CrY0-lead white10)
- CrY0.8 : lead white (hydrocerussite)= 1:1 (folder name: CrY0.8-lead white50)
- CrY0: lead white (hydrocerussite)= 1:1 (folder name: CrY0-lead white50)
- CrY0.8: lead white (hydrocerussite)= 1:9 (folder name: CrY0.8-lead white90)
- CrY0: lead white (hydrocerussite)= 1:9 (folder name: CrY0-lead white90)
Files
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Additional details
- Created
-
2024-06-18
- Research focus Title
- Photoaged chrome yellow-based oil paint mock-ups
- Research focus Category
- Object/mockup
- Research focus Description
Evaluation of light-induced colour changes on a series of oil paint mock-ups made of different chrome yellow types in the presence and absence of other pigments, including zinc white, red lead, vermilion, lead white and emerald green
- Research Activity Type
- Object Examination/Colour change detection
- Technique
- UV-VIS-NIR Reflectance Spectroscopy
- Technique Category
- Point analysis
- Tool / Equipment (or Software) Description
JASCO V-570 spectrophotometer
- Tool / Equipment (or Software) reference
- https://jascoinc.com/products/spectroscopy/uv-visible-nir-spectrophotometers/
- Examination Methodology
Acquistion of UV-Vis-NIR reflectance spectra at different aging steps.
Aging protocol: irradiation by UV-filtered Xenon lamp. Irradiance (250-1085 nm) ≈ 3×10^3 W/m^2
Set of samples Correspondence Tx: aging time CrY0.8-pure, CrY0-pure, CrY0.8-emerald green, CrY0-emerald green, CrY0.8-red lead, CrY0-red lead, CrY0.8-vermilion, CrY0-vermilion, CrY0.8-zinc white90, CrY0-zinc white90, CrY0.8-zinc white50, CrY0-zinc white50 T0: 0min; T1: 1h:30min; T2: 3h; T3: 5h; T4: 10h; T5: 24h; T6: 48h; T7: 72h; T8: 98h:30min; T9: 114h:30min CrY0.8-lead white10, CrY0-lead white10, CrY0.8-lead white50, CrY0-lead white50, CrY0.8-lead white90, CrY0-lead white90 T0: 0 min; T1: 2h:50min; T2: 7h; T3: 14h:40min; T4: 27h; T5: 52h; T6: 76h:30 min; T7: 104h:30min; T8: 127h:30min; Vermilion-pure, emerald green-pure, zinc white-pure, lead white-pure T0: 0 min; T1: 1h:15min; T2: 3h; T3: 5h:15min; T4: 23h:45min; T5: 66h; T6: 88h:45 min; T7: 110h:20min - Equipment setup - Experimental
Diffuse reflectance spectra were recorded in the 200–850 nm range, using a 5 nm spectral bandwidth.
- Object Examination Scale
- Macro
- Examination Class or Type
- TimeSeries
- Specific Scope linked to the Project
- Development of a model for the virtual reconstruction of colors in paintings and prediction of their changes overtime
- Measurable Entity / Property
- Color/chemical changes
- Material Category
- Paintings