He worked as an engineer before joining the Army at the end of the First French Empire.
Afterwards he worked as a toolmaker and inventor.
He never married.
He applied for many patents, most of them for long-forgotten inventions for buckle-making machines and other tools.
His most successful inventions had to do with the reproduction of 3D artworks in 2D and 3D.He produced the illustrations for The authors of England: A series of medallion portraits of modern literary characters, engraved from the works of British artists by Henry Fothergill Chorley from 1838: this work contains a ten-page introduction outlining the new procedure of mechanically creating engravings from cameos and medals, developed by Collas.
He developed this method between 1825 and 1832, demonstrating it at the Salon of 1833.
When it was finished in 1850, it reproduced some 15,000 items, spread over 20 volumes.His second great invention came in 1836, when he produced a pantograph-like machine to reproduce sculptures in different scales and materials.
The first product of the company was a reproduction of the Venus of Milo, but for the next ten years nothing much happened, until Barbedienne sent some pieces to The Great Exhibition of 1851, where the company received a special medal.