Answered by b4227, August 6, 2021 at 12:46:52 PM EDT.
A: All of the Ziller Inks have an acrylic binder which makes them waterproof, so if you are addressing envelopes, you do not need to be concerned about the stray raindrop. Or if you are doing calligraphy for place cards, wet fingers won't smear the ink, after it is dry.
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