• 1830 : Failure of all the two partners’ attempts to bleach the brown bitumen to directly obtain positive images. Daguerre discovers the distillat of lavender oil , without giving it any photo sensitive property.

In june the two men work together for two weeks in Saint-Loup-de-Varennes.

Daguerre


Domaine du Gras
• 1831 : Niépce works on all sorts of resin without positive results.

• 1832 June : New visit by Daguerre at Niépce’s.The partners use as a photosensitive agent a distillat of lavender oil and obtain images in less than 8 hours’ exposure time. Niépce names their process :the Physautotype.

• 1832, Novembre : Daguerre comes back to St-Loup-de-Varennes to work with Niépce on the new process.


• July 5th 1833 : Niépce dies suddenly, none of his inventions having being officially acknowledged.