Non-destructive and non-invasive methodology for the in situ identification of Mexican yellow lake pigments
Por:
Angelica Garcia-Bucio, Maria, Casanova-Gonzalez, Edgar, Mitrani, Alejandro, Luis Ruvalcaba-Sil, Jose, Angel Maynez-Rojas, Miguel, Rangel-Chavez, Isaac
Publicada:
1 dic 2022
Resumen:
According to historical sources, yellow colorants have been used since
ancient times; despite this, their identi-fication in textiles,
Mesoamerican codices and other colonial documents is still a difficult
task to perform. Most of the analytical techniques traditionally
employed in the identification of yellow dyes, like HPLC-mass
spec-trometry, require object sampling, an undesirable and often
forbidden procedure when dealing with cultural heritage objects. While
some information can be obtained by non-invasive and non-destructive
multi-technique analyses with portable equipment (allowing in situ
studies); only few works have dealt with the in situ analysis of yellow
dyes using such techniques, most of them with unsuccessful results. This
is due to a combination of factors, mainly the low concentration of the
dye on the object (caused by their high coloring power), their fast
degradation, and the similarity of the molecule structures responsible
for the yellow hues. In this work we present a non-destructive and
non-invasive multitechnique methodology for the in situ analysis of
Mexican yellow lake pigments with portable equipment: Raman
spectroscopy, colorimetry, and fiber optic reflectance spectroscopy
(FORS), as well as UV, false color infrared (FCIR) and false color
ultraviolet imaging. The colorant specimens studied include:
zacatlaxcalli (Cuscuta tinctoria), xochipalli (Cosmos sulphureus),
annatto (Bixa orellana), old fustic (Maclura tinctoria), marigold
(Tagetes erecta), sweet-scented marigold (Tagetes lucida) and weld
(reseda luteola), the latter of European origin. The results presented
in this paper shed some light on the non-destructive identification of
yellow lake pigments -elaborated with the Mexican traditional specimens
mentioned above -with the aim to allow their in situ identification on
original artworks.
Filiaciones:
Angelica Garcia-Bucio, Maria:
Univ Nacl Autonoma Mexico, Inst Fis, Circuito Invest S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
Casanova-Gonzalez, Edgar:
Univ Nacl Autonoma Mexico, CONACyT, Inst Fis, Circuito Invest S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
Mitrani, Alejandro:
Univ Nacl Autonoma Mexico, Inst Fis, Circuito Invest S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
Luis Ruvalcaba-Sil, Jose:
Univ Nacl Autonoma Mexico, Inst Fis, Circuito Invest S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
Angel Maynez-Rojas, Miguel:
Univ Nacl Autonoma Mexico, Inst Invest Estet, Circuito Mario de la Cueva S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
Rangel-Chavez, Isaac:
Univ Nacl Autonoma Mexico, Inst Fis, Circuito Invest S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
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