was: Brightener in Epson Premium Glossy
was: Brightener in Epson Premium Glossy
- Subject: was: Brightener in Epson Premium Glossy
- From: neil snape <email@hidden>
- Date: Mon, 30 Sep 2002 07:05:06 +0200
on 30/09/2002 06:51, Graeme Gill at email@hidden wrote:
>
This is typical of fluorescence.
>
Non-whitener paper will slope gently down towards the blue
>
end, and less steeply into the UV.
>
>
For large amounts of whitener, the reflection factor may
>
even exceed 100% at the top of the lump.
I've always wondered about the relation if any about fluorescence and
optical brighteners. What are the effects, how does a spectro non-uv or uv
see this and what bias is the key factor to how it is seen. Do the inks
themselves filter the reflected light in a way that influences the paper
base (unprinted)?
Neil Snape email@hidden
http://mapage.noos.fr/nsnape
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