Modifiche

==External references==

==External references==

* http://www.penexchange.de/english/sites/klassiker/tula.html An article on tula

* [http://www.penexchange.de/english/sites/klassiker/tula.html] An article on tula

* http://en.wikipedia.org/wiki/Niello Description of niello.

* [http://en.wikipedia.org/wiki/Niello] Description of niello.

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[[Category:Glossary]]

[[Category:Technology]]