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I went a bit stir-crazy after tendonitis in my wrist first struck my writing hand, and stopped me from wielding a pen painlessly. In the first three months, not only did I spend more money on pens that I couldn't immediately use, I also bought myself a pH meter on eBay (which would only be shipped from the US by way of its Global Shipping Program for some nebulously calculated postage and 'import fees' totalling 75% again of the price of the item itself). It was something I could use without exacerbating my condition, to find out some attribute of each ink, but I didn't stop to think clearly about why I would want to know. The pH meter arrived two months ago, and has been just sitting there in an unopened box all that time. Part of what prompted me was that some folks here seem very keen to know, as if the pH of an ink was important to know. In whatever state of mind back then, I was influenced by the sentiment even though I really don't have a good reason to discover that particular piece of information. Money has been spent on the device, and I'm OK with that, but at least I'm now questioning why I would bother making the effort (in the future) to test the pH of any particular ink, much less every ink I have queued for review. Most of the prospective reasons I can think of why any user of an ink would want to know seem to have to do with risk management and minimisation: Potential of highly acidic or alkaline inks to corrode nibsI trust most, if not all, of my modern (gold or stainless steel, plated or uncoated) to stand up to any commercial fountain pen ink (that is marketed as such), and the wellbeing of my one-and-only vintage pen concerns me not at all.Potential of highly acidic or alkaline inks to damage celluloid or cellulose acetateIs there such potential? I have only one celluloid pen that is of any value, and that is converter-filled, so any risk there should be minimal. I do have three aurolide piston-fillers by Aurora, but I don't recall coming across any claim or complaint that a highly acidic ink has damaged a modern aurolide pen. As for my other piston-fillers — a Pelikan M815 Metal-Striped, a Pelikan M600 Vibrant Orange, a Pelikan M200 Smoky Quartz demonstrator, a PenBBS 309 Cloud and a whole bunch of Wing Sung 3008 pens — the only one I'd 'worry' about because of its value to me is the M600, and I use Pelikan 4001 Blue-Black in it so that ought to be safe?Potential for issues when mixing acidic and basic inksI don't mix inks.Potential of remnants of highly acidic inks to react with bases in pen-flushing and pen-soaking solutionsI habitually flush the nibs, feeds, sections and converters with water 'clean' first before dunking any of them into my ultrasonic cleaning tank or any other bath to soak, so the risk should be minimal, maybe with the exception of Pilot CON-70 converters.Potential of highly acidic inks to damage paper prematurelyI don't really have content to write with a fountain pen that I desperately want to ensure will remain in good condition for the next thirty, forty or fifty years. When I do, I'll look into ISO 12757-2, and perhaps restrict my choice of inks for those applications to the commercial inks that satisfy the relevant sections of that standard for archival document inks.Is there something I missed, such that there may actually be a reason why it would be worth my while to test the pH of an ink and find out, before deciding whether to fill a particular pen with it? ... Just to pre-empt: If I test an ink for its pH because it is of some value for me to know, and I produce an ink review for it, I'll publish the result; there is no reason for me to withhold it. However, if that information is of no value to me, then I won't bother testing it and finding out in the first place, when its potential to damage any pen or nib that I don't have (and won't use) is completely irrelevant and unimportant. Edit: grammar and punctuation