A blog post that mentions Postcrossing:
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Thanks! I like the tip on waterproof ink. I love my fountain pen but have avoided using it on cards for fear of smudging/blurring if wet.
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The blog is nice and the tips are handy.
Same, even when using normal pens I feel bad if it accidentally smears a little because my hands are just sweaty normally haha. I like doing calligraphy for pen pals but not postcards.