Hi Steve,

The UV inks are an exciting development. UV-cure technology seems like near-magic to me. I use a UV-curable adhesive to make glass emulsion wells. I can work under a yellow bug light for many minutes, but the second (make that nanosecond!) it sees UV light, it sets up and adheres like the original glass. I have had my first attempts (Fail!) outside in my garden as decoration for four years. Rain, sun, frost...and they still are glued rock solid. Amazing.

With the inks, though, is it a matter of substrated material or the inks themselves? Here's some info: http://www.signindustry.com/flatbed_...-JL_UVpt2.php3

I plucked the following quote out. It seems to suggest that the reason the UV inks work so well is that they dry faster than they can penetrate the subbing. If that's the case, they could go on any substrate, which isn't the case with silver gelatin emulsions. Of course, this is just one article and no doubt the picture is complicated and evolving. Gotta love science! I'd love to hear more about the films you're working with and perhaps even get my hands on them (hint, hint )

Water-based UV inkjet technology is attracting attention because it uses water as a diluent to produce lower viscosity. Water-based UV inks are formulated with UV-curable resin emulsions. But there are drawbacks with this technology. The system needs to get rid of the water before the UV lamp cures the ink.

“Getting rid of the water is difficult as you want to cure as quickly as possible to prevent undesirable dot gain, wicking or feathering into the substrate,” says Emery. “If water is present, then the ink will not adhere to the substrate. UV curable inks that are 100 percent solids will be the first product available.”