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What secret ingredient in fountain pen ink makes it flow smoothly but can also change over time? | #fountain pen ink

What secret ingredient in fountain pen ink makes it flow smoothly but can also change over time?

What secret ingredient in fountain pen ink makes it flow smoothly but can also change over time?

Fountain pen ink is more than just a writing fluid—it’s a carefully crafted mixture that has fascinated writers, artists, and calligraphers for centuries.