If one used Mylar then the exposures would tend
>to be quite long.;-)
Very good point. Funny though that no one has noted this. There are a lot of "precision" printers out there and it seems that this would have been observed and reported on. I've used mylar in the past and didn't notice anything unusual, but I was printing out Ziatypes in the sun and that wasn't "precision", and I wasn't noticing the times. If it is completely opaque to UV, this leads one to wonder. One guess is that it is opaque below about 300 nanometers, and that is out of range for most alt-photo. Science marches on.
Dick
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