Yes, but all the known and published components alone are not sufficient to reach that high quality level of Acros and Provia with that parameter. There is much more needed, and I am sure Fujifilm will never publish it. Because it would not make sense to give such a competitive advantage away.
Henning
Let me offer one or two thoughts about Iridium, Selenium, and Tellurium salts and how this might relate to Fujifilms secret sauce that makes their reciprocity characteristics so good. If Fujifilm is relying on some kind of metal salts, and if the metal salts are not of some special form (such as having the metal chelated with some kind of special chelating agent) then from a technical perspective it would not be too hard to figure out what metals are being added. There are at least two types of elemental analysis that could be employed 1) atomic absorption spectrophotometry (and closely related techniques), and 2) inductively coupled plasma mass spectrometry (ICPMS). Generally speaking, ICPMS would be the preferred technique. It can be sensitive into the part per trillion level in some cases. Neutron activation analysis might also be applicable, though I know less about that technique, and in any case it is not very widely used, probably because of the fact that it uses ionizing radiation.
The methods mentioned above give only the atomic composition. They generally tell us nothing of the chemical form of the elements, but if all you are interested in is the atomic composition then they may be sufficient. Even if one wants to know more than the atomic composition ICPMS can be a good starting point upon which to build.
If one wants to know the chemical form then the next thing to try is probably electrospray mass spectrometry (ESIMS) using an ultrahigh resolution mass spectrometer. Under certain conditions this can tell you a lot about the chemical form of a target analyte. For example, if the metal ion is chelated then using ESIMS on a high resolution mass spectrometer can tell you a lot about the chemical composition, and it might be enough to identify the compound almost unambiguously.
Also, it would appear that Fuji is relying on a trade secret. A trade secret provides very strong protection of intellectual property that does not expire. The down side is that if someone uses legal means to figure out what a trade secret is then the trade secret-protected intellectual property is no longer protected. Just in case anyone is unfamiliar with this aspect of the law, we are not talking about patents here because patents require disclosure of the intellectual property and patents have expiration dates.
Part of the reason I shoot film now is because of variety of experiences offered by old film cameras, as opposed to identical picture-taking machines that only differ by a logo.
