12. Technical aspects

Index:

Morrisson, Cécile 1940-

Title:

 Le métal des chrysobulles (XIe-XIIe siècle) / Cécile Morrisson et Maryse Blet-Lemarquand

Source:

Revue Numismatique 164 (2008) p. 151-167, pl. 1

Abstract:

We present the irst analyses ever carried over imperial gold bullae: one of Michael VII doukas (1071-78) in the Whittemore collection and two of the latin emperors of Constantinople, Baudouin i (1204-5) and Henri i (1206-16) in the Cabinet des Médailles (BnF). their composition is the same as that of contemporary gold coins and helps to date the Michael Vii bulla in the early part of his reign. the alloy of the latin bullae is similar to that of 12th-century hyperpyra. Both are made of two disks like the Byzantine ones. in th  middle, between these disks a wrapped gold leaf formed the canal through which passed the purple thread. The irst of these bullae was soldered by brazing, but the two disks of the other were assembled by doubling the border of the reverse over the obverse.

 

Index:

Padfield, Tim 1937-

Title:

Analysis of Byzantine copper coins by X-ray methods / by Tim Padfield ; with a numismatic commentary by Philip Grierson

Source:

Methods of chemical and metallurgical investigation of ancient coinage : a symposium held by the Royal Numismatic Society at Burlington House, London on 9-11 December 1970 / ed. by E. T. Hall and D. M. Metcalf. - London : Royal Numismatic Society , 1972