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The silver surface processing called ''tula'', better known in jewelery as ''[[niello]]'', is one of the variants used to made [[overlay]] decorations during in the early period of fountain pens. This process was typical of European production (and in particular has been used by [[Kaweco]]).
[[File:Soennecken-80-Tula-Silver-Barrel.jpg|thumb|A [[Soennecken]] pen with a ''tula'' band]]
The silver processing called ''tula'' (tipical of German production, from which we take the word), better known in jewelery as ''[[niello]]'', is one of the variants used to made [[overlay]] decorations during in the early period of fountain pens. This process was typical of European production (and in particular has been used by [[Kaweco]]).