The Portuguese have determined the structure of the medieval blue dye

Portuguese scientists have identified molekulyarnuyu the structure of natural blue-violet dye, which in the middle ages was obtained from the fruit of chrozophora dye plants (Chrozophora tinctoria). The results of chemical analyses methods of gas chromatography-mass spectrometry and NMR and theoretical calculations showed that the coloring substance is derived germein, which the authors called prosopalgia. A study published in the journal Science Advances, will help scientists develop ways to preserve the medieval art, which used this dye.

From medieval written sources it is known that extracts from the plant chrozophora dye (Chrozophora tinctoria) widely used to create illuminated manuscripts decorated with colorful miniatures and ornaments. Blue and purple solutions extracted from the fruit of this plant, kept after adsorption on the fabric in dry form. Cut a piece of colored cloth so people clean up the surface with suitable binder and used the resulting liquid as paint.

Other blue dyes extract chrozophora dyeing is distinguished by the fact that until now, attempts to unravel the structure of the substance, giving a blue color, was not successful. In order to solve this centuries-old mystery Maria Melo (Maria J. Melo) from the NOVA University in Lisbon gathered a multidisciplinary group of scientists which included experts in the analysis of natural products, experts in reproduction medieval colors, and biologists, a landmark in the Portuguese flora.

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