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Characterization of the evolution of indigo blue by multispectral imaging
Author(s) -
Tello Burgos Natalia,
LópezMontes Ana,
Valero Eva M.,
Nieves Juan Luis,
Blanc Mª Rosario
Publication year - 2022
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.22721
Subject(s) - indigo , multispectral image , characterization (materials science) , environmental science , phycocyanin , pigment , biological system , chemistry , computer science , materials science , artificial intelligence , cyanobacteria , nanotechnology , optics , geology , physics , organic chemistry , paleontology , bacteria , biology
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.