An Advanced Spectroscopy Lab That Integrates Art, Commerce, and Science as Students Determine the Electronic Structure of the Common Pigment Carminic Acid

Liu, Suqing; Odate, Asami; Buscarino, Isabella; Chou, Jacqueline; Frommer, Kathleen; Miller, Margeaux; Scorese, Alison; Buzzeo, Marisa C.; Austin, Rachel N.

doi:10.1021/acs.jchemed.6b00644

Cited by 12 publications

(9 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…That was noticed in previous studies when comparing carminic acid pigment spectra, not having aluminum centered complex, to carmine pigment. 36,37…”

Section: Resultsmentioning

confidence: 99%

“…That was noticed in previous studies when comparing carminic acid pigment spectra, not having aluminum centered complex, to carmine pigment. 36,37 Fourier Transform Infrared Spectroscopy Analysis Micro-FT-IR mapping measurements were conducted on the daguerreotype surface as well as the carmine reference deposited on a polished silver plate. The resulting spectra are shown in Fig.…”

Section: Raman Analysismentioning

confidence: 99%

See 1 more Smart Citation

Imaging the Surface of a Hand-Colored 19th Century Daguerreotype

et al. 2018

View full text Add to dashboard Cite

Daguerreotypes are valued artifacts that constitute a unique historical photographic memory of the 19th century. Understanding their surface chemistry is important in order to conserve and, when necessary, to restore them. Colored highlights were often added by hand to emphasize different features on the daguerreotype's subjects. In the present work, we report on a daguerreotype that was hand-colored with a red pigment that was added to the cheeks of the two individuals. A series of experiments using micro-Raman and micro-Fourier transform infrared spectroscopy and synchrotron-based X-ray fluorescence microscopy and absorption spectroscopy are used to analyze the surface and to determine the nature of the pigment used as well as the common elements present in the fabrication of the daguerreotypes.

show abstract

“…That was noticed in previous studies when comparing carminic acid pigment spectra, not having aluminum centered complex, to carmine pigment. 36,37…”

Section: Resultsmentioning

confidence: 99%

Section: Raman Analysismentioning

confidence: 99%

Imaging the Surface of a Hand-Colored 19th Century Daguerreotype

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The basic color of a dyed yarn is determined mainly by the nature of the dyes employed. However, variations in color may be obtained during the dyeing process mainly through changes in mordants and adjuvants, 107‐109 pH and temperature of the dyeing bath, 110 and the natural color of the fleece employed 17 . The DDCD of yarns of different colors will be discussed in terms of the potential number of main dyes employed and their visible spectra, the differential binding of dyes to mordants, and the use of fleece with different natural pigmentation.…”

Section: Discussionmentioning

confidence: 99%

The colors of pre‐Hispanic textiles from cemeteries in the Quillagua and San Pedro de Atacama oases of Northern Chile

Niemeyer

Cárdenas

Véliz

2021

Color Research & Application

View full text Add to dashboard Cite

Few sources of red (anthraquinoids) and blue (indigoids) dyes were used in pre‐Hispanic textiles from different cultures, periods, and areas in the South‐Central Andes. Yellow dyes have been shown to be mainly flavonoids. Since flavonoids exhibit wide color variations, ample distribution dependent on biogeographical region, and species‐specific patterns, color variation in yellow‐dyed textiles and sources of yellow dyes are predicted to be higher in relation to red‐ and blue‐colored textiles. The study of textile colors, in particular the comparison between yellow and other colors, should shed light on the relationship of people with the environment and on the processes of selection of sources of raw materials for textiles. Colorimetric data in the CIELAB three‐dimensional space were obtained of yarns sampled from pre‐Hispanic textiles from San Pedro de Atacama (37 textiles, 79 yarns of different colors) and Quillagua (41 textiles, 95 yarns of different colors), two archeological areas in Northern Chile sustaining different plant communities. The textiles were assigned to different styles (hence to different biogeographical regions). The results showed that the degree of dispersion of colorimetric data was larger in red than in blue yarns, and did not differ between any other pair of colors, and that the degree of dispersion of colorimetric data of yarns from textiles of different styles differed significantly within yellow yarns but not within yarns of other colors. These results are discussed in terms of the nature, variety, and sources of the dyes involved and reveal the use of a limited number of yellow dyes in Northern Chile.

show abstract

“…In this equation,

refers to the cuvette (1 cm × 1 cm) and the concentration of the pigment solution is 1%; A means the absorbance at the maximum absorption wavelength ( λ max ) of the pigment solution; V (mL) means the volume of the pigment solution; m (g) meansthe quality of the pigment. The color properties of the pigment were evaluated in terms of the CIE L*a*b* system [ 28 , 29 , 30 ]. Where L* is the brightness, a* is the green (-) or red (+), and b* represents the blue (-) or yellow (+).…”

Section: Methodsmentioning

confidence: 99%

Preparation and Characterization of Water-Insoluble Gardenia Blue Pigment

Gao

Liu

et al. 2021

Materials

View full text Add to dashboard Cite

Based on molecular simulations, the synthetic route of water-insoluble gardenia blue pigment was prepared by the reaction of genipin and L-Phenylalanine methyl ester hydrochloride. A highly purified pigment was obtained after extraction by chloroform and purification by silica gel column chromatography, and the value of color is up to 288. A study on the structural characteristics of the pigment was implemented with a scanning electron microscope, ultraviolet-visible spectrophotometer, Fourier transform infrared spectrometer, X-ray photoelectron spectrometer, and quatropde-time of flight mass spectrometer. The results showed that the surface of the pigment was largely smooth and spherical; The λmax was 607 nm, and the main functional groups include O-C=O, C=O, C-N, C=C, OH, and benzene ring; We detrained six different molecular weight and chemical structures of pigments and speculated the particular structures and formation mechanisms of three kinds of pigment, whose molecular weights are 690.1156, 720.1226, and 708.1246 Da, respectively. The pigment was only able to be dissolved in ethanol, methanol, acetone, ethyl acetate, and other strong polar organic solvents, but was not able to be dissolved in water, ethyl ether, petroleum ether, and other weak polar organic solvents. In terms of light and thermal stabilities, water-insoluble gardenia blue pigment is significantly better than water-soluble gardenia blue pigment (p < 0.05). When it is under direct light for 7 days or incubated at 80–120 °C for 24 h, the pigment residual rates were 74.90, 95.26, 88.27, and 87.72%, respectively.

show abstract

An Advanced Spectroscopy Lab That Integrates Art, Commerce, and Science as Students Determine the Electronic Structure of the Common Pigment Carminic Acid

Cited by 12 publications

References 34 publications

Imaging the Surface of a Hand-Colored 19th Century Daguerreotype

Imaging the Surface of a Hand-Colored 19th Century Daguerreotype

The colors of pre‐Hispanic textiles from cemeteries in the Quillagua and San Pedro de Atacama oases of Northern Chile

Preparation and Characterization of Water-Insoluble Gardenia Blue Pigment

Contact Info

Product

Resources

About