Hi Paul,

Sounds interesting. I may or may not end up doing it, but send the info. And thanks.

Grant

: Why not build one?

: You need a roll supply for the blueprint paper which is baffled so it is not
: exposed to light. That's not too hard to do. You can cut sheets of
: material from this before exposing them.

: You can make a large, flat, exposure area from a sheet of 1/4 inch plate
: glass.
: Suspend UV rich halogen bulbs above this for your exposure. Or you can get
: photoflood bulbs from a camera store.

: Some people use a 4 foot flourescent fixture and UV rich bulbs in that.

: For the "dry" process you use a "diazo" material which
: uses a light-sensitive nitrogen dye that is processed in in the fumes from
: ammonia. This is a positive to positive process (like a xerox photocopy)
: which would probably be good for reproducing your plans and drawings. Get
: good ventilation.

: The "wet" process uses either silver or iron based compounds. The
: iron based materials are cheaper and are developed in plain water. You
: could use a tray for soaking preglued wallpaper and slosh it through, or
: make a large flat tray from plywood, fiberglass, and epoxy resin. Should
: be a nice simple stitch and glue project

: You can make your own blueprint paper for this process, too. Only two
: chemicals to mix in water. You just paint this on sheets of paper with a
: foam brush or roller and let it dry in a dark place. If you want, I'll
: post or e-mail the recipe. The image is quite a nice blue -- and very
: permanent -- so try to avoid dripping the mix on anything expensive.

: PGJ