Proteinaceous copper green
Andalusia
12th Century
Source: Melo, M. J., Nabais, P., Vieira, M., Araújo, R., Otero, V., Lopes, J., & Martín, L. (2022). Between past and future: Advanced studies of ancient colours to safeguard cultural heritage and new sustainable applications. Dyes and Pigments, 208, 110815.
Recipe Details
Ingredients
copper pigment, proteinaceous binder
Preparation Steps
The formulation consists of a copper-based pigment mixed into a proteinaceous matrix (Table 1, p. 6).
Original Recipe Text
The formulation consists of a copper-based pigment mixed into a proteinaceous matrix (Table 1, p. 6).
Evidence
"The green colour was only found in the Koran (parchment folia), having been identified as a proteinaceous copper green, with an infrared spectra similar to the one found in the 'bottle-green' of Portuguese monastic illuminations."
Remarks
The copper pigment is posited to promote protein degradation via a radical mechanism leading to chain scission and the formation of calcium oxalate as a final product (p. 6). This color is considered very important in Islamic tradition (p. 9).
Scientific Analysis
Analytical Techniques
FTIR
Visible reflectance spectra
Certainty Level
Confirmed
Instrumentally Verified
Verified
Metadata
Material Type
pigment
Binderproteinaceous
Paper TypeParchment
ColorGreen
RegionAndalusia
Approx. Year1150
Source Information
AuthorMelo, M. J., Nabais, P., Vieira, M., Araújo, R., Otero, V., Lopes, J., & Martín, L.
CollectionKoran (1198)
Language
N/A
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