Ernst, This “phenomenon” of some optically brightened paper having a higher a* component is a mystery to me. To your knowledge, is it simply a function of having added a lot of FWA to the substrate, during the manufacturing process? Such that, as more and more FWA is added, a* simply becomes progressively more positive? Turning into “redder” appearance, visually, at some point? I confess don’t know enough of the behavior of stilbene and other FWA added to inkjet medias, personally, but my hypothesis is that all substrates – inkjets or not – are made up of the SAME FWA, I can’t say whether different FWAs are used, industrially, in the fabrication process? The thought would have never crossed my mind that different FWAs are used for different papers. I seem to recall that papers with a lower b* value like those used in coated offset papers, like -3.00 or -4.00, rarely get positive a* values? They’re always around 0.50 or 0.60, usually quite low, and hence never appear “reddish”. I’ll have to check on the Fogra 52 data… (The plot thickens…) Best / Roger From: Ernst Dinkla <info@pigment-print.com> Sent: Monday, June 24, 2019 3:32 AM To: graxx@videotron.ca Cc: 'colorsync-users?lists.apple.com' List <colorsync-users@lists.apple.com> Subject: Re: Epson Doubleweight Matte Roger, However you will see that effect in the Hahnemühle Baryta FB 350, a magenta cast, that is the result of OBA blue emission + red reflection and little green+yellow contributing to the paper white. Chromatic adaption can not cope with it. Epson Double Weight Matte paper has a similar spectral plot but less pronounced. Met vriendelijke groet, Ernst Dinkla Grafische Techniek Quad, piëzografie, giclée www.pigment-print.com <http://www.pigment-print.com> On Sun, Jun 23, 2019 at 6:48 PM Roger Breton via colorsync-users <colorsync-users@lists.apple.com <mailto:colorsync-users@lists.apple.com> > wrote: Finally got hold of a fresh sample of Epson Doubleweight Matte paper. Here is a link to its measurements, in Excel. https://1drv.ms/x/s!AkD78CVR1NBqkLVN8r7LgHiGqxRYZg In M1 mode, I believe it's going to be sufficient to carry my humble color separations experiments : CIE Lab D50/2 (KonicaMinolta FD-7) 93.86 2.53 -8.01 Thank you all for your kind and patient help / Roger P.S. "Funny", this paper appears to have a slightly "reddish" tint. Of course, it does not appear "reddish" to me, because of chromatic adaptation, no matter what lighting I observe it under. _______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com <mailto:colorsync-users@lists.apple.com> ) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/ernst.dinkla%40gmail... This email sent to ernst.dinkla@gmail.com <mailto:ernst.dinkla@gmail.com>