New insights in technology characterization of medieval Valencia glazes
2015
This study shows the first Raman Microscopy (RM) and SEM-EDX characterization of two 14th
and 15th century lead-glazes and lustre ceramics from the Manises and Paterna workshops
(Valencia, Spain) produced after the Aragon Christian conquest of the Iberian Peninsula (14th
century). According to experts, these coetaneous ceramics were most probably involved in a
process of technological transfer from the Islamic area of Southeast Spain to the Christian area of
Valencia (East Spain) at the beginning of the 14th century; later on the celebrated Manises and
Paterna workshops were formed. Although these ceramics have been studied widely in terms of
production technology (ceramic body, glazes and lustre) using an array of diverse analytical
techniques, until now a RM study has not been carried out. This paper presents results regarding the
complex chemical composition of the glaze and lustre coloring agents and the quality of color
manufacturing processes, elucidating firing conditions via spectral components analysis (i.e. Qn for
stretching/bending components) and polymerization index (Ip), emphasizing chronology and
pigment technology changes between both Valencian workshops. Coloring agents identified in
glazes and lustres were cobalt present in blue glazes, copper in greenish glazes, copper and cobalt in the turquoise glaze and pyrolusite in black glazes. Tin oxyde was used as an opacifier in white glazes. Two lustre manufacture recipes were recognized mainly based on copper and silver compounds. Calculated firing temperatures were up to 1000oC for white glazes and up to 600oC for lustre and color glazes.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
38
References
0
Citations
NaN
KQI