Re: UV Transparency
Alex Nanson (alec@norlex.demon.co.uk)
Thu, 27 Feb 1997 23:33:32 +0000
In message <3.0.1.32.19970227104713.0074d100@roadrunner.com>, Richard
Sullivan <richsul@roadrunner.com> writes
>Bob Schramm Says:
>
> 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.
>
>
Some years ago I worked for a reprograhics company, and we used to coat
thousands of meters of Melinex (Mylar) film with diazo, had the Melinex
been opague to UV (350 - 430 nms) we wouldn't have sold much of the
coated film!
Alex
--
Alex Nanson
alec@norlex.demon.co.uk
Gloucester. UK