Analyses of a Green Copper Pigment Used in a Thirteenth-Century Wall Painting
STUDIES IN CONSERVATION(2013)
Abstract
A thirteenth-century sacred and profane wall painting has been rediscovered during renovation work in a city castle in Krems, Lower Austria. A frieze with alternating blue circles and green diamonds attracted attention to the unusual green colour. Several analyses by means of light microscopy, scanning electron microscopy-energy-dispersive X-ray analysis and laboratory and synchrotron X-ray diffraction show that the green colour stems mainly from clinoatacamite, a copper trihydroxychloride polymorph of Cu-2(OH)(3) Cl which has probably been synthesized for this masterpiece. The pigment has been mixed in a lime matrix.
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Key words
green copper pigment,wall,thirteenth-century
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