Nová kritéria pro klasifikaci a rozlišení jílových a železitých pigmentů různého původu

0375813 - ÚACH 2012 RIV CZ cze C - Conference Paper (international conference)
Hradil, David - Hradilová, J. - Bezdička, Petr
Nová kritéria pro klasifikaci a rozlišení jílových a železitých pigmentů různého původu.
[New kriteria for classification and differentiation between clay and iron oxide pigment sof various origins.]
ACTA ARTIS ACADEMICA 2010: THE STORY OF ART - ARTWORK CHANGES IN TIME. Praha: Akademie výtvarných umění v Praze, 2010, s. 107-122. ISBN 978-80-87108-14-7.
[Interdisciplinary Conference of Academic-Materials-Research-Laboratory-of-Painted-Artworks /3./. Praha (CZ), 24.11.2010-25.11.2010]
Institutional research plan: CEZ:AV0Z40320502
Keywords : earth pigments * earths * bole grounds * mineralogical analysis * clay minerals * X-ray microdiffraction
Subject RIV: CA - Inorganic Chemistry

Pigmenty se železem, ačkoliv tvoří velmi početnou skupinu, nebyly nikdy považovány za příliž vhodné k datování barevných vrstev a určování provenience díky jejich hojnému výskytu v přírodě, snadné dostupnosti a používání všech historických prehistorických dobách.

Pigments containing iron, although they form a very large group, have never been considered very suitable for datation of color layers and identification of the origin of the painting, due to their abundant occurrence in nature, good availability and widespread use in all historical and pre-historical periods of time. In this paper we have verified that mineralogical composition of clay minerals in earthy pigments is a suitable tool for more detailed specification of material provenance and, in the case of ground layers, also the provenance of the artwork as such. It was obviously convenient to preferably use raw materials from a close and thus also cheaper source. For the purposes of statistical comparison we evaluated elemental composition of earthy grounds on 70 paintings from the 16(th)-18(th) centuries from Czech collections. We performed detailed mineralogical analyses for a selected representative number of grounds on 35 samples in total. We discerned 6 types of material in total 2 types of boles, 3 types of other earths, and one type representing iron-rich red from oxidized zones of hydrothermal ore deposits. We were able to distinguish between earthy pigments of Central European origin (coming from Czech and Bavarian locations) and those coming from North-Italian sources. Thus we were able to assign anonymous paintings to an appropriate place of origin.
Permanent Link: http://hdl.handle.net/11104/0208374