Title: Mostly waterproof, but not for writing checks; not for lower-priced Lamys.
Product review: This ink has the ancient "iron gall" formula with its nifty aroma. Iron gall ink is waterproof but not safe enough for writing checks. Iron gall ink looks good from a "wet-writing" pen, but the lower-priced Lamy "Safari" and "Al-Star" pens are not "wet" enough. Also, you should never let iron gall ink dry out in a pen (permanent clogging!), and you should flush an iron-gall-using pen in both directions with plain water (pulling water in and forcing water out) every month or so.
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