March 25, 2023
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Nice to see someone has experimented using alternative inks for the PB. What other inks have you used (if any)? Would any rapidograph ink work (here you can hardly get even rotring)? Also, one of the cool things about the original FP10 ink is that it dries waterproof and flows of the brush smoothly, does the ink you use work the same?

Sorry for bothering you with son many questions and thanks for your time!


Hello, I found your article very helpful but I have question:
You said to never use India ink, but in the specifications from the website it says it is a India ink. So what’s the difference?
Is this a lighter ink? I just got the brush pen I don’t want to ruin it.
Thank you


Monica, the issue is probably due to the high level of lacquer that inks like Speedball use. it’s what makes them so glossy and opaque, but also dries rigid and can force the bristles of your regular brush apart, rot the hairs, and get clogged in the pocket brush nozzle thingy.


I’ve only ever heard of people dipping their brush pens in speedball, never filling the cartridge, for good reason.

I’m debating whether to try rapidograph universal india in mine, everything about the brush is synthetic so it’s inert to ammonia for cleaning out any possible clogs. I’ve been refilling with carbon black inks with no issues so far but it’s not as rich as shellac/laquer inks.

I’ll definitely pick up a bottle of ultradraw on your recommendation, thanks Brian.

What’s the difference on paper between rapidographs universal india and ultradraw? which is darker?

Would love your thoughts, please comment.x
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