- Invented salted paper print
- coating writing paper with it then put a coat of silver nitrate on top
- Through contact printint he could make a cameraless picture as it made a negative version of objects
- The coated paper darkens on exposure to light so their was no need for development
- He could then make a positive image by contact printing the negative
Importance: Orginated the method upon which all subsequent photography was based (until the invention of electronic imaging)
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