References for the investigation of mild extraction techniques

Dyed wool references for extraction task

In order to clarify the composition and behavior of organic , the research team extends the research on dyestuff identification by optimizing and reviewing dyestuff mild extraction techniques of textiles and organic pigments used on cultural heritage objects, the aim is to obtain data about the various methods, their advantages and their limitations.

Traditional extraction methods of paint samples or textile samples for chromatographic analysis are often too aggressive. Often, not only fragile colours (dyestuffs) like carrotenoids (present in for example; annatto seeds and safflower floss) are destroyed during the extraction. Likewise coloured sugars could be lost or even transformed into another new molecule. Preserving these sugars by using a soft extraction technique could be extremely useful as the sugars could provide information about the original botanical or biological source, also provide information about how the or pigment was prepared or something about the environment in which the plant or insect/mollusk source existed.

The challenge is to be able to release the organic colorant components into solution by breaking up the colorant-textile mordant or the colorant-substrate complexes without harming the glycosides or unstable dyestuff.

The extraction experiments are being preformed using reference of lake pigments produced at the Expert Meeting held on the 14th of Octobre 2010. The wool reference was dyed by Art (me) using semi-historical recipes modified for lab-conditions.

Keeping you posted

Art

Research team:  National Gallery London, U.K. | Ormylia Art Diagnosis Center, Greece | KIK / Institut royal du Patrimoine artistique, Belgium | ICN – Rijksdienst voor het Cultureel Erfgoed, The Netherlands | The Doerner Institut, Germany

 

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Other Intitutes involved in the CHARISMA Project:

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