Are those numbers within normal manufacturing tolerances? (even w/o actually changing factories?)
Between batches of the same paper there should be less difference. Between new production methods/facilities it is a good result. The reason I included the spectral plot of the earlier 280gsm Smooth Pearl production (sans Prestige :-) is to show what the old Ilford Imaging could achieve when the 280gsm was replaced by the 310 grams Prestige version.
The texture is identical, the gloss slightly less in the N product sample.
I'm not going to add more spectral plot images here but as expected the N Gold Fibre Silk spectral plot looks like the old one (and several other ones; Canson, Innova, etc) but is slightly higher in overall white reflection. Could be a fresher sample but I have identical higher white reflectance spectral plots of the Hahnemühle Photo Silk Baryta 310 and very interesting (as I was on a hunt for that much longer) of the Felix Schoeller J23160 True Baryta 310gsm. It is my guess that the last company has been the source for this paper much longer, they have the patents on baryta inkjet paper and supplied the baryta paper bases for silverhalide photo processes way before inkjet papers became available.
In best case I can add all the measurements within a week to SpectrumViz for download but till then you have to wait, nothing is added so far. There will be interesting new ones. I did not have time for the Breathing Color booth, the Tecco booth etc but anyone interested in having samples included can find my address.
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Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htmApril 2014, 600+ inkjet media white spectral plots.