This may be at risk of generalized vagueposting but... Based on what I've read here in recent years, some have raised big question marks on that group's test methods/results. (Search this forum for the name, and maybe the word "trust" at the same time and you'll find some things to read...) So much so that I've been using other resources suggested here for reliable objective info (hopefully). Aardenberg is one I reference.
I wanted to mention this here because I recall one of those discussions was specifically around some "200-yr" claims for a particular brand, and some questionable dynamics with that brand. I don't recall the specifics now but when I saw you mention 200 years and that group's name it def triggered something in memory..., but it might be only coincidence.
Given my spotty memory on it at the moment it's probably best I let you explore it firsthand.
Sorry for the side-track from the main topic.
Thanks Kyle: I am aware and don’t disagree on the question marks as to the reliability of Wilhelm’s permanence tests and above all their testing methodology. I am a huge supporter of Mark McCormick’s outstanding work at Aardenburg, including his breakthrough research about LILIS and his push for updating permanence testing parameters so as to test for LILIS too, as it may potentially severely reduce Wilhelm’s permanence ratings for papers that include OBA’s (and of course TiO2). Sadly but sort of unsurprisingly, his efforts have had very little traction with paper manufacturers and distributors and as far as I know discussions with Wilhelm to update their testing methodology have long stopped.
However:
1. The biggest flaw (that I am aware of!) in Wilhelm’s testing methods only affects papers containing OBA’s (because LILIS only occurs when TiO2 is present at the same time as OBA’s) and therefore Wilhelm’s results for OBA-free papers should be (much?) more reliable than those for papers containing OBA’s.
2. As far as I am aware, Mark at Aardenburg has not released independent permanence testing reports in a while, so (always as far as I know) Wilhelm is currently the only source of “independent” third-party permanence tests of paper/ink combinations.
3. Whatever Wilhelm’s tests may be worth, they are an independent assessment of lightfastness of Canon’s and Epson’s inks when used in combination with certain papers. As I mentioned, the comparison between Epson’s penultimate generation UltraChrome inks versus Canon’s penultimate generation Lucia Pro inks when used in combination with several Canson papers (many of which are OBA-free) was overwhelmingly in favor of Epson UltraChrome inks. Also, Wilhelm’s tests on Epson’s latest generation UltraChrome PRO10 inks show a meaningful improvement over the previous generation UltraChrome HDX inks in terms of lightfastness: it is true that this second set of tests was made on a selection of Epson papers, but these included several Epson Legacy papers which are widely believed to be made by Canson based on their own papers, so this second test does appear to correlate to a large extent with that made on Canson papers.
4. Having said all of the above, my point stands that an unqualified assertion that Canon Lucia Pro 2 inks perform better in terms of lightfastness than the current generation of Epson UltraChrome inks is an important statement, but I have yet to hear on what that assertion is based, as I am not aware that any independent permanence tests have been run on Canon Lucia Pro 2 inks and I certainly hope that the assertion is not based on Canon’s own marketing claims, because if Wilhelm’s testing parameters may be questionable, should we instead take Canon’s own claims as unquestionable? And even if we did, shouldn’t we then consider Epson’s own permanence claims for their UltraChrome PRO10 inks (which coincidentally match Canon’s) equally unquestionable?
So, all I am asking is whether there are any objective parameters backing up a statement that Canon Lucia Pro 2 inks outperform Epson UltraChrome PRO10/12 inks in terms of lightfastness.