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d’archéologie orientale - Le Caire

Verre byzantin et islamiqueByzantine and Islamic Glass

Maria Mossakowska-Gaubert

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Blue and Other Coloured Translucent Glass Decorated with Enamels: Possible Evidence for Trade in Cobalt-Blue Colourants
WARD, Rachel
Gilded and Enamelled Glass from the Middle East
British Museum Press, London, 1998, p. 116-121
Ashmolean Museum (Oxford) ; British Museum (LondresLondon) ; Victoria and Albert Museum (LondresLondon)

[801, 850] [1150, 1500] [1801, 1900]
• Question with regard to the transition between natron glass and plant-ash glass (high magnesia soda-lime glass):
– Raqqa: the earliest evidence for use of a new alkali in the Islamic world - the early 9th century.

• Distinction of four groups of chemical compositions of glass from Raqqa (Abbasid, Ayyubid): Al2O3, MgO.

• Chemical analyses of Islamic blue glasses and enamelled decorations from Ashmolean Museum, British Museum and Victoria and Albert Museum (Ayyubid, Mamluk and 19th century):
Na2O, MgO, Al2O3, SiO2, P2O5, SO3, Cl, K2O, CaO, TiO2, Cr2O3, MnO, Fe2O3, CoO, NiO, CuO, ZnO, As2O3, SnO2, Sb2O3, BaO, PbO.
– In all cases the blue glasses are coloured by cobalt oxide, accompanied by a zinc oxide impurity (only 19th century Islamic blue glass contains no detectable zinc oxide).

• Close similarity between the cobalt colourant used for the blue bodies of the Islamic enamelled vessels and that used in the production of contemporary (13th-14th century) cobalt-blue French glass vessels (the compositions of the French and Islamic glasses are entirely different in terms of the relative levels of their other components):
– question of the trade in cobalt-blue colourants between medieval Europe and Islamic countries: lumps of blue frit or deeply colored blue glass;
– question with regard to the exact location of a cobalt source characterised by zinc oxide - hypothetical source: Anorak near Tabriz (Iran).
Syrie Syria Raqqa production

Version 5, données dudata date 30 janvier 2013January 30th 2013