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[[File:Aurora-Internazionale-Serie-Color-Body.jpg|thumb|left|Example of different colors]]

[[File:Aurora-Internazionale-Serie-Color-Body.jpg|thumb|left|Example of different colors]]

For its mechanical strength, unbreakable, waterproof, for ease of processing and above all for the almost infinite capacity of being made in different colors, from the mid '20s celluloid became the main material used by fountain pens manufacturers and it remained so until the '40s when the [[plastic resin]] started to spread.  

For its mechanical strength, unbreakable, waterproof, for ease of processing and above all for the almost infinite capacity of being made in different colors, from the mid '20s celluloid became the main material used by fountain pens manufacturers and it remained so until the '40s when the [[plastic resin]] started to spread.

Although some book reported that the celluloid was introduced on the market by [[Sheaffer]] actually the first American company to have used it extensively in its production was [[LeBoeuf]], who used it for its fountain pen starting from about 1920 thanks to a patent ({{Cite patent|US|1302935}}) for the production of pipes in this material, the [[Conway Stewart]] contends  this leadership, asserting that they were the first manufacturer to have produced (still in those years) the first pen in celluloid.  

Although some book reported that the celluloid was introduced on the market by [[Sheaffer]] actually the first American company to have used it extensively in its production was [[LeBoeuf]], who used it for its fountain pen starting from about 1920 thanks to a patent ({{Cite patent|US|1302935}}) for the production of pipes in this material, the [[Conway Stewart]] contends  this leadership, asserting that they were the first manufacturer to have produced (still in those years) the first pen in celluloid.