There are some instructions on making carbon tissue in the archive. I found
the cheapest lining paper rolls from my local DIY store perfect for the job.
Peter Marshall
On Fixing Shadows, Dragonfire and elsewhere:
http://faraday.clas.virginia.edu/cgi-uva/cgiwrap/~ds8s/Niepce/peter-m.cgi
Family Pictures & Gay Pride: http://www.dragonfire.net/~gallery/