I read with interest a recent post about harsh inks. I was surprised to find that Iroshizuku inks was listed. I used Iroshizuku inks in my vintage pens i.e. Esterbrooks. With no ill effects.
How is it determined that an ink is harsh and will cause problems? Are not some of these issues due improper pen hygiene? If Iroshizuku is on the that list would that include sailor inks also?
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