S.B.R.E. Brown noted in a review recently that Noodler's Liberty's Elysium had melted the diaphragm on his Edison pen (he didn't mention the ink in that video, but I asked in a comment, and he told me). Since it's fairly rare that we get such specific information, and because my son still had the bottle of NLE that I had given him (from the first run, I think), I felt it would be justified to have another go at the sac melting experiments. This time, in addition to the fragments in control (Waterman Blue) and treatment inks, I sacrificed a new sac to the experiment in order to address criticism that immersion is not a very good approximation of what actually happens in a pen. I put the sac in a sample vial and filled the sac with Noodler's Liberty's Elysium. That was back in November. I have opened it now and again to refresh the air and to have a look, and just now I took it out, rinsed it, and examined it. There has been no apparent degradation after 8 weeks of exposure. As usual, the simplistic "single-agent" hypothesis (Noodler's Ink melts latex all by itself) continues to elude replication, at least in anything vaguely resembling "the short term". I guess I'll leave it running. It's not hurting anything, but I really suspect that there are two parts to this equation.
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