The 'shadowgraph' or 'photogram' above is one of many images
that Talbot produced by placing items on his sensitized paper and exposing
it to light.
Talbot also produced images of other subjects
including some delicate images of patterns in lace. He also used
this method also to copy sketches and engravings. He made his first
images using a camera around 1834.
Initially, Talbot coated his paper with silver
nitrate solution, but subsequently found that he achieved greater
sensitivity by treating his silver nitrate paper with a solution of common
salt to create a mix of silver nitrate and silver chloride.