I used this speedball ink with my tips as a dip ink. Color rich matte black. Still getting used to using a fountain pen I'm on a learning curve and have seen a few drips and made a few messes and gotten a good amount on my hands too. This goes away with a little cleaning. I bought this ink specifically because it's waterproof after reading the reviews some say it's waterproof some say it's 98% waterproof. I hope this is enough for addressing envelopes. Be careful when holding the bottle upright after opening the ink, otherwise ink may spill if left in any other position. I try to keep all my ink bottles upright once opened. I think it's a good ink, good for teaching, good for addressing envelopes etc. It's important to use good quality calligraphy paper as regular carbon paper will make a mess with large drops of ink. It works fairly well with the Staedtler practice paper that comes with some pens.
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