Characterization of the evolution of indigo blue by multispectral imaging
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AuthorTello Burgos, Natalia; López Montes, Ana María; Valero Benito, Eva María; Nieves Gómez, Juan Luis; Blanc García, María Rosario
John Wiley & Sons
Artificial agingCapillary electrophoresisIndigoMultispectral imagingPrincipal components
Tello Burgos, N... [et al.]. Characterization of the evolution of indigo blue by multispectral imaging. Color Res Appl. 2021; 1- 12. [https://doi.org/10.1002/col.22721]
SponsorshipFEDER/Junta de Andalucia-Consejeria de Economia y Conocimiento A-HUM-164-UGR18; Ministry of Economy and Competitiveness of Spain DPI2015-64571-R; Spanish Ministry of Economy and Competitiveness; Ministry of Economy and Competitiveness; Junta de Andalucia; European Commission
Indigo blue is a natural organic color from the Indigofera tinctoria plant. It is insoluble in water and does not require mordant to fix the color; therefore, due to its nature it can be considered as a pigment or dye. The identification of indigo in cultural heritage is very difficult due to the complexity of its chemical formula and the changes that it can undergo in certain conservation and exposition conditions. For this reason, characterization of possible degradation, transformation, and reaction processes is essential for its identification. In this study, multispectral imaging has been used for the first time as noninvasive technique to characterize the aging state of indigo blue using samples aged in a controlled climate chamber under extreme conditions of humidity, temperature, and light. The technique has proven to be very promising for this application, together with classification techniques based on machine learning approaches.