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The ''niello'' technique is ancient and dates back to the Egyptians. The processing is quite difficult when is made, as in the classical case, to coat silver engraved plates, It becomes even more complex in the case of the coating of a fountain pen, where the cylindrical shape makes it far complex to put the alloy in to the engravings. Because of its rarity, and the great craft value, fountain pens made ​​in ''tula'' have a great interest to collectors.

The ''niello'' technique is ancient and dates back to the Egyptians. The processing is quite difficult when is made, as in the classical case, to coat silver engraved plates, It becomes even more complex in the case of the coating of a fountain pen, where the cylindrical shape makes it far complex to put the alloy in to the engravings. Because of its rarity, and the great craft value, fountain pens made ​​in ''tula'' have a great interest to collectors.

==Riferimenti esterni==

==External references==

* http://www.penexchange.de/english/sites/klassiker/tula.html Un articolo su questo tipo di lavorazione

* http://www.penexchange.de/english/sites/klassiker/tula.html Un articolo su questo tipo di lavorazione