For carbon printing you are better off getting DAS sensitizer. Holmburgers is organizing a purchase right now.
Hopefully, you are not too late: http://www.apug.org/forums/forum379/...ml#post1447181

It is much more environmentally friendly and way better than dichromate since you can make your tissues ahead of time and have them ready for exposure at any time - unlike dichromate, DAS sensitized tissue does not deteriorate in storage.

Eugene.