Unfortunately ISO standard 18901 is for processing of film. Bummer.
One particular problem I have when searching for this stuff is that apparently, from a conservator's point of view, the word "archival" is applied to processes and techniques used to care for and store an item, and not to the creation of the item itself.
In other words, there are many references to 'archival standards for storage materials', but few references to 'archival processing" with the very notable exception of microfilm.
I have sent off email to a handful of the photographers who claim to process to 'museum archival standards' enquiring about which museum, which standard, and what process they use.
I am with Oren - there is vastly more solid data from testing on color materials (ra-4, ilfochrome, etc.) and inkjet prints than there is on gelatin silver prints. Vastly more.
I also agree wholeheartedly that the longevity of prints (silver prints, chromogenic prints, inkjet prints, any prints) is highly dependent on a set of variables that are essentially uncontrolled or uncontrollable (e.g. chemical composition of wash water, trace contaminants in paper base), and that as a result, it's perfectly possible to hew to some processing standard and still get horrible outcomes.
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