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Your worst reactions?
(jlai.lu)
Welcome fountain pen enthusiasts from around the world! Share your fountain pen obsession with fellow enthusiasts. Pens, inks, paper - everything fountain pen related is welcome!
Manufacturers usually have to cater to the lowest common denominator.
There are very good chances that there is a large group of people who have mixed the wrong kinds of ink together, damaged their pens &/or possessions then contacted them to complain & demand compensation.
99% of the time there should be no issues but with several thousand different inks they can't test every combination.