Sandra Valada
Biographic Data
| ID | 882881 |
|---|---|
| NAME | Sandra Valada |
| GIVEN NAMES | Sandra |
| FAMILY NAME | Valada |
| SIGNATURE | VALADA S |
| AFFILIATIONS | University of Évora |
| ORCID | 0000-0003-2146-7024 |
| VERIFIED | Yes |
| TOTAL WORKS | 14 |
| TOTAL CITATIONS | 14 |
| AUTHOR COUNT | 14 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2013 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 3 |
Methodological advances in polychromy research
This study presents a comprehensive, non-invasive investigation of the polychromy onsculptural fragments from the West Pediment of the Archaic Temple of Apollo atDelphi. Utilizing a multimodal analytical framework, comprising macroscopic X-rayfluorescence (MA-XRF), Raman spectroscopy, hyperspectral imaging (HSI), andremote spectral imaging (RSI), the research identifies a sophisticated palette includingcinnabar, Egyptian blue, hematite, goethite,…
Material and Technical Study of Symeon Savvidis’ Ring Around the Rosie (ca. 1908) Using VNIR Hyperspectral Imaging with Mobile Raman and h-EDXRF
This study presents the first technical examination of Ring Around the Rosie (ca. 1908), an easel painting by the Greek artist Symeon Savvidis (1859–1927). Despite Savvidis’ significance within Greek modernism, little is known about his materials and working practices from a scientific perspective. To address this gap, the painting was analysed using VNIR hyperspectral imaging (HSI), portable Raman spectroscopy, and handheld energy dispersive X r…
From Flanders to Portugal
This study offers fresh insights into the technical and stylistic exchanges between Flemish and Portuguese panel painting during the late 15th and early 16th centuries. By comparing two contemporaneous works, we trace Flemish influence in Portugal through a detailed materials and techniques analysis. Non-invasive, in situ methods—including energy dispersive X-ray fluorescence (XRF), macro-photography (MP), infrared reflectography (IRR), and dendr…
Combining in situ elemental and molecular analysis
Annunciation or Adoration? The workshop practice and the hesitations of a Portuguese mannerist painter revealed by infrared reflectography
The Power of Combining MA-XRF, Infrared Reflectography and Digital Microscopy to Unveil the Production of the 16th Century Illuminated Charter of Évora
In recent decades, many works have been devoted to the study of materials and painting techniques used to produce illuminated manuscripts. If the analyses were once largely invasive, the approach has become increasingly more in situ and non-invasive over the years. This work presents the results of the analysis of the Portuguese Charter of Évora, an illuminated manuscript that dates back to 1501, combining an elemental mapping technique (MA-XRF) …
The Matter from Which an Orange Colour Is Made
The painting The Descent from the Cross, painted in 1620 by Pedro Nunes (1586–1637), presents two large figures with orange-coloured fabrics with conservation problems. Through the analysis of two samples with several analytical techniques, especially scanning electron microscopy combined with X-ray spectroscopy and Raman microscopy, it was possible to conclude that the orange colour is due to a complex artificial pigment made of amorphous arseni…
A Multi-Analytical Study of Egyptian Funerary Artifacts from Three Portuguese Museum Collections
A diachronic, multi-analytical approach combining EDXRF, μFTIR, μRaman, SEM-EDS, and Py-GC/MS has been adopted with the aim to study for the first time the painting materials used to decorate Egyptian funerary masks and sarcophagi ranging from the Late Period to the Roman Period and stored in the Archaeological National Museum (MNA) and the Carmo Archaeological Museum (MAC) of Lisbon and the Natural History Museum of the University in Oporto (MNH…
On the Two Working Palettes of Almada Negreiros at DN Building in Lisbon (1939–1940)
This paper reports the first analytical approach carried out on two working palettes by Portuguese modernist master Almada Negreiros, found in 1991 behind old wood cabinets at the DN building in Lisbon. This is the only known occasion Almada left behind the color experiments done before starting to paint in the nearby walls and as such, it is a unique opportunity to analyze the materials and painting techniques that were originally used. The anal…
The use of glass particles and its consequences in late 16th century oil painting
A Painter in the Shadow
The painting collection of Santa Casa da Misericórdia da Lourinhã is amongst Portugal’s most notable and scarcely best-known cultural heritage. The artistic interest of this pictorial group, besides the advanced state of degradation of a number of the paintings, together with the ruined circumstances of the building accommodating the collection, today in reconstruction, were the key reasons for this study. Thermo-hygrometric measurements were car…
Academic success in schools in the Algarve
This paper presents the results of a case study conducted among school principals in the southern region of Portugal, located in urban, suburban and rural settings. The five cases that comprise this study were subjected to a final rating of "Very Good" in the external evaluation process of schools, whose data were collected through semi-structured interviews and documentary analysis (regulations and educational project, reports of the external ev…
Problems of Analysis by FTIR of Calcium Sulphate–Based Preparatory Layers
This paper provides a contribution to FTIR analysis of calcium sulphate‐based grounds of paintings when a mixture of compounds with different degrees of hydration is present. The study is based on the analysis with that technique, electron microscopy coupled with energy‐dispersive X ‐ray spectrometry and X ‐ray diffraction of both the grounds of 16th‐century P ortuguese paintings and reference samples prepared with anhydrite and calcium sulphate …
A comparative study on the health and well-being of adolescent immigrants in Spain and Portugal
The terms on which the integration of new generations of immigrants into Portuguese and Spanish societies happens will have a decisive influence in the future of both countries. Therefore, promoting their health, well-being, and psychosocial adaptation is a matter of strategic interest. This paper analyses psychosocial factors associated with well-being and psychological adjustment on a sample of 108 adolescents (55 males and 53 females), childre…
Problems of Analysis by FTIR of Calcium Sulphate–Based Preparatory Layers
This paper provides a contribution to FTIR analysis of calcium sulphate‐based grounds of paintings when a mixture of compounds with different degrees of hydration is present. The study is based on the analysis with that technique, electron microscopy coupled with energy‐dispersive X ‐ray spectrometry and X ‐ray diffraction of both the grounds of 16th‐century P ortuguese paintings and reference samples prepared with anhydrite and calcium sulphate …
A Painter in the Shadow
The painting collection of Santa Casa da Misericórdia da Lourinhã is amongst Portugal’s most notable and scarcely best-known cultural heritage. The artistic interest of this pictorial group, besides the advanced state of degradation of a number of the paintings, together with the ruined circumstances of the building accommodating the collection, today in reconstruction, were the key reasons for this study. Thermo-hygrometric measurements were car…
A comparative study on the health and well-being of adolescent immigrants in Spain and Portugal
The terms on which the integration of new generations of immigrants into Portuguese and Spanish societies happens will have a decisive influence in the future of both countries. Therefore, promoting their health, well-being, and psychosocial adaptation is a matter of strategic interest. This paper analyses psychosocial factors associated with well-being and psychological adjustment on a sample of 108 adolescents (55 males and 53 females), childre…
The Power of Combining MA-XRF, Infrared Reflectography and Digital Microscopy to Unveil the Production of the 16th Century Illuminated Charter of Évora
In recent decades, many works have been devoted to the study of materials and painting techniques used to produce illuminated manuscripts. If the analyses were once largely invasive, the approach has become increasingly more in situ and non-invasive over the years. This work presents the results of the analysis of the Portuguese Charter of Évora, an illuminated manuscript that dates back to 1501, combining an elemental mapping technique (MA-XRF) …
The use of glass particles and its consequences in late 16th century oil painting
Academic success in schools in the Algarve
This paper presents the results of a case study conducted among school principals in the southern region of Portugal, located in urban, suburban and rural settings. The five cases that comprise this study were subjected to a final rating of "Very Good" in the external evaluation process of schools, whose data were collected through semi-structured interviews and documentary analysis (regulations and educational project, reports of the external ev…
A comparative study on the health and well-being of adolescent immigrants in Spain and Portugal
The terms on which the integration of new generations of immigrants into Portuguese and Spanish societies happens will have a decisive influence in the future of both countries. Therefore, promoting their health, well-being, and psychosocial adaptation is a matter of strategic interest. This paper analyses psychosocial factors associated with well-being and psychological adjustment on a sample of 108 adolescents (55 males and 53 females), childre…
Problems of Analysis by FTIR of Calcium Sulphate–Based Preparatory Layers
This paper provides a contribution to FTIR analysis of calcium sulphate‐based grounds of paintings when a mixture of compounds with different degrees of hydration is present. The study is based on the analysis with that technique, electron microscopy coupled with energy‐dispersive X ‐ray spectrometry and X ‐ray diffraction of both the grounds of 16th‐century P ortuguese paintings and reference samples prepared with anhydrite and calcium sulphate …
Academic success in schools in the Algarve
This paper presents the results of a case study conducted among school principals in the southern region of Portugal, located in urban, suburban and rural settings. The five cases that comprise this study were subjected to a final rating of "Very Good" in the external evaluation process of schools, whose data were collected through semi-structured interviews and documentary analysis (regulations and educational project, reports of the external ev…
A Painter in the Shadow
The painting collection of Santa Casa da Misericórdia da Lourinhã is amongst Portugal’s most notable and scarcely best-known cultural heritage. The artistic interest of this pictorial group, besides the advanced state of degradation of a number of the paintings, together with the ruined circumstances of the building accommodating the collection, today in reconstruction, were the key reasons for this study. Thermo-hygrometric measurements were car…
The use of glass particles and its consequences in late 16th century oil painting
A Multi-Analytical Study of Egyptian Funerary Artifacts from Three Portuguese Museum Collections
A diachronic, multi-analytical approach combining EDXRF, μFTIR, μRaman, SEM-EDS, and Py-GC/MS has been adopted with the aim to study for the first time the painting materials used to decorate Egyptian funerary masks and sarcophagi ranging from the Late Period to the Roman Period and stored in the Archaeological National Museum (MNA) and the Carmo Archaeological Museum (MAC) of Lisbon and the Natural History Museum of the University in Oporto (MNH…
On the Two Working Palettes of Almada Negreiros at DN Building in Lisbon (1939–1940)
This paper reports the first analytical approach carried out on two working palettes by Portuguese modernist master Almada Negreiros, found in 1991 behind old wood cabinets at the DN building in Lisbon. This is the only known occasion Almada left behind the color experiments done before starting to paint in the nearby walls and as such, it is a unique opportunity to analyze the materials and painting techniques that were originally used. The anal…
The Power of Combining MA-XRF, Infrared Reflectography and Digital Microscopy to Unveil the Production of the 16th Century Illuminated Charter of Évora
In recent decades, many works have been devoted to the study of materials and painting techniques used to produce illuminated manuscripts. If the analyses were once largely invasive, the approach has become increasingly more in situ and non-invasive over the years. This work presents the results of the analysis of the Portuguese Charter of Évora, an illuminated manuscript that dates back to 1501, combining an elemental mapping technique (MA-XRF) …
The Matter from Which an Orange Colour Is Made
The painting The Descent from the Cross, painted in 1620 by Pedro Nunes (1586–1637), presents two large figures with orange-coloured fabrics with conservation problems. Through the analysis of two samples with several analytical techniques, especially scanning electron microscopy combined with X-ray spectroscopy and Raman microscopy, it was possible to conclude that the orange colour is due to a complex artificial pigment made of amorphous arseni…
Annunciation or Adoration? The workshop practice and the hesitations of a Portuguese mannerist painter revealed by infrared reflectography
Combining in situ elemental and molecular analysis
From Flanders to Portugal
This study offers fresh insights into the technical and stylistic exchanges between Flemish and Portuguese panel painting during the late 15th and early 16th centuries. By comparing two contemporaneous works, we trace Flemish influence in Portugal through a detailed materials and techniques analysis. Non-invasive, in situ methods—including energy dispersive X-ray fluorescence (XRF), macro-photography (MP), infrared reflectography (IRR), and dendr…
Methodological advances in polychromy research
This study presents a comprehensive, non-invasive investigation of the polychromy onsculptural fragments from the West Pediment of the Archaic Temple of Apollo atDelphi. Utilizing a multimodal analytical framework, comprising macroscopic X-rayfluorescence (MA-XRF), Raman spectroscopy, hyperspectral imaging (HSI), andremote spectral imaging (RSI), the research identifies a sophisticated palette includingcinnabar, Egyptian blue, hematite, goethite,…
Material and Technical Study of Symeon Savvidis’ Ring Around the Rosie (ca. 1908) Using VNIR Hyperspectral Imaging with Mobile Raman and h-EDXRF
This study presents the first technical examination of Ring Around the Rosie (ca. 1908), an easel painting by the Greek artist Symeon Savvidis (1859–1927). Despite Savvidis’ significance within Greek modernism, little is known about his materials and working practices from a scientific perspective. To address this gap, the painting was analysed using VNIR hyperspectral imaging (HSI), portable Raman spectroscopy, and handheld energy dispersive X r…
Cultural Heritage Materials Analysis (11 works) · Art (9 works) · Building materials and conservation (9 works) · Conservation Techniques and Studies (9 works) · Painting (9 works) · Chemistry (7 works) · Visual arts (7 works) · Archaeology (6 works) · Portuguese (6 works) · History (5 works)