Re: MonacoPROFILER and UV
Re: MonacoPROFILER and UV
- Subject: Re: MonacoPROFILER and UV
- From: Roger Breton <email@hidden>
- Date: Sat, 09 Sep 2006 12:22:41 -0400
Marco,
> I am not a scientist, so what I am going to say here is pure conjecture
> based on inductive reasoning (or is it deductive...?).
>
> But here it goes: a UV filter is a physical object of a given shape, color
> and texture, made to fit a given condition created by FWAs (Fluorescent
> Whitening Agents).
>
> Marco Ugolini
I once had the UV filter made by X-Rite measured spectrally and found that
it cut off all emission below 400nm. So, from a tungsten light source that
is typical of most spectros (except the Spectrocam which used a Xenon light
source, and hence is closed to "natural light"), no radiation from below
400nm is able to make its way to excite the FWA in the substrate, if there
are any FWA in the paper to begin with.
In practice, say we measure a paper that has a b* of -4 with an instrument
not fitted with a UV filter, that same paper, all of a sudden, will measure
a b* of -1 or close to 0 when measured with UV filtration.
Which is right? Or true?
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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