[argyllcms] Re: More direct method of measuring FWA?

  • From: Klaus Karcher <lists@xxxxxxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Wed, 14 Apr 2010 08:47:50 +0200

Hi Ben,

Martin Weberg wrote:
Hi Ben

2010/4/14 Ben Goren<ben@xxxxxxxxxxxxxxxx>:
It just occurred to me. Most papers laced with FWA are coated on one side only.
The back side of the paper is uncoated and has no brighteners.

Most sheet-fed offset papers that I encountered have equal spectral
properties sidewise and yet contain FWA. And yes, most inkjet papers
are probably non-equal, but I don't think FWA content is the only
factor. There might be non-FWA whitening agents, drying agents and
differing paper structure effecting measurements.

Inkjet papers are typically coated on one side. As FWA-free papers are rare these days, the /uncoated/ side should show fluorescence usually I think. At least this is the case with one of these "FWA free" proofing papers (ORIS PearlPROOF™ Super): the ink receiving layer is black under UV light while the backside glows bright blue. This means that this proofing substrate has an "ordinary" paper base and an UV-blocking, FWA-free coating on the print side. And -- as Martin said -- FWA content is surely not the only difference between the front and backside.


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