I work in a regulatory chemistry lab so having basically everything resistant ink is a must for archival & forgery purposes. Where I'm at we're under EPA regulations (vs. ISO or TNI) so it only says indelible ink. The majority of the inks I use are Noodler's bulletproof inks & have been approved by our QA/QC officer. Since Noodler's inks are not ISO or anything else certified I decided to do my own tests with some of our common solvents in the lab in case an auditor ever asks about it. My test wasn't anything super scientific but should be enough to show anyone the permanency of the ink. While I was at it I figured it's nice to share my results with you.
The test: I filled a beakers with 6 common solvents we use in our lab. The solvents are Hexane, Acetone, Ethyl Acetate, Methylene Chloride, methyl tert butyl ether(MTBE), and Methanol. I wrote the name of each ink on plain copy paper and let it dry overnight. I then let it soaked each piece of paper in the corresponding solvent for at least 1 minuet. During the soak I agitated the piece of paper several times in an attempt to force the ink to wash off. And for reference I wrote the name of the solvent the paper was placed in with a black Bic pen. After soaking I removed the paper and placed it on the counter to dry.
Edit: One other note, the ink labeled Noodler's Teal is a 1:4 mix of Bad Green Gator and Bad Blue Heron respectively.
This first picture is of everything before it was soaked in solvent. And please forgive my bad handwriting as I was scribbling the names and wasn't worried about penmanship.
Edited by MadAsAHatter, 21 February 2020 - 13:45.