What do you mean by "make the paper"? Do you mean the base or the coating? The facility involved in the bankruptcy is the coating mill in Marly, Canton Fribourg, Switzerland. My understanding is that the paper base comes from elsewhere and the coating is done in Marly. My understanding is that the Marly coating facility also coats other papers on contract for other brands. If you look at the notices on the packaging of GFS, it says "Made in Germany". Hard to know what percentage value of the content is associated with that designation by EU rules. Canson Baryta Photographique is pretty much an identical product, but that packaging says "Made in France". I understand that Canson, however, does not coat its own papers. I hope their Baryta Photographique was not being coated in Marly. There are only several coating mills in Europe and who makes exactly what components of a paper for others or on their own account is "unclear" at best.
Sihl, division of Diatec, has several coating facilities in Europe and it coats also for Hahnemühle. Harman probably has part of their analogue coating equipment in use for inkjet media, if the deal with HM was not more than marketing that has not changed. Felix Schoeller has inline coating facilities in its paper making plant in Weissenborn. One could wonder where Bergger, Canson, InnovaArt, Somerset, Olmec have their coating done in Europe. That covers roughly the European manufacturers of the inkjet papers we discuss here. Folex in Switzerland has coating facilities, at least for their own products but could coat for others too.
Yes Ilford Imaging must have coated for companies like Canson.
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Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htmJuly 2013, 500+ inkjet media white spectral plots.