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Why is using disposable pens still common practice?
(lemmy.today)
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There are a large number of water-resistant and water-proof inks; both Sailor and Montblanc make several. Legal documents are (usually) required to be signed in waterproof blue or black ink, so you'll find a lot of selection in especially these brands that cater to business people.
Any ink that is indelible is going to be impossible to get out of clothing if you spill it; I think that's rather self-evident?