Re: More on Crystal Clear OHP

I have also used Crystal Clear and agree with your findings. I would add that locking up the wheels in front stops the track marks on the material.

George
>
> From: Sandy King <sanking@clemson.edu>
> Date: 2004/11/06 Sat PM 05:12:04 GMT
> To: alt-photo-process-l@sask.usask.ca
> Subject: More on Crystal Clear OHP
>
> I have been working with the Crystal Clear OHP material for a couple
> of weeks in search of a less expensive substitute, especially in long
> rolls, for Pictorico. Here are some of my findings.
>
> 1. Crystal Clear prints a bit over 1/4 stop faster than Pictorico
> and the Epson OHP. This results in a significant saving of time with
> UV processes because a 400 unit exposure with Pictorico becomes about
> a 280 unit exposure with Crystal Clear.
>
> 2. Crystal Clear works perfectly for me with the Epson 2200 using the
> printer settings described in Mark Nelson's book, printing a
> predominantly green color. With this setting I have not had any
> problem with pizza wheels or any kind of coating problem. One of the
> keys here may be the fact that printing is very slow with this
> set-up, which allows the ink to dry before it touches the pizza
> wheels. You should not assume that this material will work with the
> Epson 2200 using other printer settings and/or ink color, especially
> since others using the 2200 have reported some problems.
>
> 3. The best way to dry the material is with a gentle flow of hot air.
> I tried the microwave and the oven but both caused some problems with
> the surface coating. An ideal dryer is a small ceramic heater. Se it
> on medium heat with the fan on and hang the negative about three feet
> from the heater. Drying should be complete in about an hour.
>
> 4. Even when completely dry Crustal Clear should not be used with a
> vacuum frame. The ink is much less firmly embedded in or on the
> surface of Crystal Clear than with Pictorico and the pressure of the
> vacuum frame has caused some of it to life from the negative, even
> with pressure set very low at about 7 psi. I have not experienced
> this problem when printing with a contact printing frame.
>
> 5. With the caveats mentioned, i.e. long drying time and problems in
> the vacuum frame, Crustal Clear OHP is a perfectly acceptable
> substitute for Pictorico or the Epson OHP.
>
>
> Sandy
>
>
>
>
Received on Sat Nov 6 11:48:27 2004