9/6/2023 0 Comments Chemistrry of animal hides![]() ![]() The work here demonstrates that NIR reflectance imaging spectroscopy is a useful technique that can identify and map paint binding media based on differences in chemical composition. The results are in agreement with prior site-specific amino acid analysis, underscoring the synergy of both methods. The strongest absorption associated with lipidic egg yolk features visually correlates with areas that appear to have white highlights. The mapping results show evidence for the use of both egg yolk and animal skin glue in the faces of the figures. The results show an animal skin glue binder was used for the blue skies and blue robe of the Virgin Mary, and egg yolk tempera was used for the red robes and brown landscape. Tanning changes the chemistry inside the leather fibers to make it more. This process is called the tanning process. ![]() To use a hide or skin for a leather product it needs to be processed. 1475) are imaged using a highly sensitive, line-scanning hyperspectral imaging camera. Leather tanning is the first step in the leather making process, after the hides come from the beamhouse and are cleaned from dirt, blood, salt and hair. Three of the four panel paintings from Cosimo Tura's The Annunciation with Saint Francis and Saint Louis of Toulouse (ca. In this report we demonstrate the success in identifying and mapping these binders by NIR reflectance imaging spectroscopy in situ. Their preservation combats putrefaction wherein curing using sodium chloride (NaCl) is by and large the most widely accepted method. Here we explore the utility of NIR reflectance imaging spectroscopy to map organic binders in situ by examining a series of panel paintings known to have been painted using distemper (animal skin glue) and tempera (egg yolk) binders as determined by amino acid analysis of samples taken from multiple sites on the panels. Raw hides/skins are considered to be the prime component for leather industry, which once flayed from animals, plummets to microbial attack. NIR spectroscopy provides a rapid method to assay organics by utilizing vibrational overtones and combination bands of fundamental absorptions that occur in the mid-IR. Near infrared (NIR) reflectance spectroscopy has been extensively used in the remote sensing field as well as in the chemical industry to detect organic compounds. While these mapping methods have aided in determining the distribution of pigments, there is a growing interest to develop methods capable of identifying and mapping organic paint binders as well. Results from these new methods have extended the knowledge obtained from site-specific chemical analyses widely in use. ![]() The new methods include reflectance imaging spectroscopy and X-ray fluorescence mapping. In situ chemical imaging techniques are being developed to provide information on the spatial distribution of artists' pigments used in polychrome works of art such as paintings. ![]()
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