Digital BW, The Print

Ernst: <In the end it will become clear that we never should have abandoned 
the asphalt process of Niepce. The first and last print on earth.>

I have seen it in Austin, Texas. An amazing thing.

Technically, Niépce coated a polished  pewter plate with a solution of 
bitumen of Judea. The exposure was 8 hours on a summer day. After exposure, 
the latent image was rendered visible by washing the plate with a mixture of 
oil of lavendar and white petroleum, which dissolved away the parts of the 
bitumen that had not hardened by light.

Harald

Harald Johnson
author, "Mastering Digital Printing"
DP&I.com ( http://www.dpandi.com )