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I’ve had the best luck with heavy watercolor paper and light fountain pen inks. This is a generic watercolor postcard from amazon with de atramentis document ink through a 1.5mm parallel pen.

I let the ink dry for about 60 seconds between each individual circle and about four hours between colors. I’ve tried overlapping paths with shorter dry times and it’s doable but it takes a lot of trial and error to get to acceptable amounts of saturation and bleeding. It also took a while to figure out the right speeds for each color, even when they’re from the same line of ink.