Dear Lina,
In reference to your request, comparative analyses have been conducted on a number of granulated objects in the Museo Nazionale d'Arte Orientale 'Giuseppe Tucci' in Rome.
A book and a thesis were written on the subject of ancient soldering techniques of which autogenous welding is one.
The thesis is "Indagine scientifica sulla tecnica della granulazione su reperti preziosi di età antica in area orientale” by Vania Virgili, Università La Sapienza, Rome, 2003-2004. I believe it is not online but could be requested.
The book in question is "La saldatura nell'oreficeria antica- indagine archeometriche e archeologia sperimentale" by Daniela Ferro, Edilberto Formigli, Alessandro Pacini and Daniela Tossini, CNR, Edizioni Kappa,2008.
A recent article of note is "Identification of soldering and welding processes in ancient gold jewelry by micro-XRF spectroscopy" by Scrivano et al., DOI 10.1002/xrs.2482.
Kind regards,
David Loepp
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