We have used negs from computer printout in place of liths in photoscreen.
Direct printout is not dense enough, so we printed to paper and then
photocopied to acetate. Two photocopies in register make a pretty dense neg.
One of my students produced her own Fox Talbot prints for a study a few
years back from books with reproductions of a couple of his negatives. She
photocopied these onto acetate then made salt prints.
Peter Marshall
petermarshall@cix.compulink.co.uk