U of S | Mailing List Archive | alt-photo-process-l | Re: spots and dots and UVBL solarplates

Re: spots and dots and UVBL solarplates


Just maaaaybe.... when the light is diffused (by Kreene or other
means), very close to the film and plate, it doesn't have the same
effect as when it's diffused farther away.  From a greater distance,
the light could reach a more shallow "angle of attack" when it hits
the film and passes through, giving some "undercutting" of the blocked
areas.  I think that makes sense.... :o)


On 4/6/07, Keith Taylor <taylordow@sprintmail.com> wrote:

I first heard of Kreene some years back when a friend, who's a
letterpress printer, told me he uses it because it holds finer type
and delicate serifs better than glass. So diffusion isn't a problem
or factor with Kreene.


On Apr 6, 2007, at 2:00 PM, Jon Lybrook wrote:

> SusanV wrote:
>> Right?  In fact, Jon, you say that point light source is important,
>> but doesn't using the kreene plastic negate that?  It's quite
>> milky in
>> it's translucence, so acts as a diffuser.
> Good points Susan.  I'm not sure the Kreene diffuses the UV light
> the way it does visible light, however.  It's designed to be used
> in this process, and my sense is it doesn't change the quality of
> the light, the way the different kinds of bulbs do.   My guess is
> it passes right through the stuff.   Anyone else know anything
> about how mylar or Kreene might affect transmission of UV?
> Jon

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