Re: Questions on optical brighteners, uv and fluorescence
Re: Questions on optical brighteners, uv and fluorescence
- Subject: Re: Questions on optical brighteners, uv and fluorescence
- From: "Ernst Dinkla" <email@hidden>
- Date: Mon, 30 Sep 2002 13:32:37 +0200
To make things even more complex on fluorescence of papers and inks + the
filtering of the inks themselves on the fluorescence of paper and the other
inks:
* there are Spectrometres with a UV filter in front of the lightsource like
the Spectrocam and models with a UV filter on the sensor.
* fluorescence isn't just a result of UV but can be a result of visible
light as well, more to the red end of the spectrum than the blue end in that
case.
The complexity should be reason enough to accept the influence of UV in the
test and in real life. On the other hand fluorescence in brighteners and
inks fade away or discolor faster than the other coloring agents.
Indoors UV below 350Nm isn't a factor. The fluorescence effects caused by UV
light on a print behind normal glass and indoors should be minimal. So a
normal window glass filter in front of the light source would then be a
compromise.
Ernst
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