Re: On the effect of florescence [sic]
Re: On the effect of florescence [sic]
- Subject: Re: On the effect of florescence [sic]
- From: Armand Rosenberg <email@hidden>
- Date: Fri, 4 Mar 2005 10:08:36 -0500
At 6:24 AM -0800 3/4/05, email@hidden wrote:
But what happens when FWA is present in a substrate? I (maybe foolishly)
believe that it's still possible to establish quantitatively what the
colorimetric performance is. But I have not found a method, like you and
others have written, that agrees with visual perception. Maybe because I
have not succeeded in recreating UV-free viewing conditions?
Roger Breton
Other than the obvious approach of avoiding such substrates (which,
in my own case, I am able to do) I can't think of a *simple* answer.
I would need to study this problem in a lot more detail to be able to
say intelligently if such an answer even exists, but I know of no
funding agency interested in sponsoring such research :-) As I said,
it's pretty clear that UV content (even if known and matched in great
detail) is not the whole story. Given the subjective factors involved
here, it may very well turn out that controlling the UV gives you
"good enough" results (by whatever definition you choose)... or not.
It really depends on the details (where the devil is hiding).
Seriously, I was fully expecting that someone on this list would have
a good answer for you already, beyond the obvious.
Since I am not in commercial printing, I do not understand why
fluorescing agents are required at all these days. For at-home
printing, there appear to be plenty of excellent papers that do not
have such agents, as far as I can determine. Although, to be totally
honest, I have not tested the inks I use for fluorescence, and the
test I performed on the papers is rather rudimentary.
As any knowledgeable physicist will tell you, pretty much ANY
material will fluoresce if you excite it with enough power at the
appropriate wavelength. But in most cases this is so weak that it can
be safely ignored in color applications. On the other hand, the
fluorescing agents discussed here emit readily (efficiently). What I
don't get is why they are so prevalent since it is feasible to obtain
excellent results without them, and since they clearly complicate the
color perception (and matching) problem considerably. Maybe it's
economics?
Armand
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