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RE: The Prague Orloj: fountain pen and watercolor pencil
I use the IC-100 cartridges from Pilot. (My go-to pen is a Pilot Metropolitan.) They’re inexpensive, and come in a variety of colors, though my favorite are the blue-black and green.
If I remember correctly, Pilot is a relatively water resistant ink. All my Metropolitans are EU versions and take standard international cartridges. So I tend to use a converter with bottled ink.
The cartridges I get are pretty water soluble. Never tried the converter, although both my Metro and my Prera came with them. :) That’s next on the list!