January 17, 2022

7 thoughts on “Tool Review: Pentel Pocket Brush Pen

  1. 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!

  2. I tried using india ink, but it gummed up the brush to bad (in fact, I had to throw that brush away.) The Rapidograph Ultradraw is the only other one I’ve used and it dried very dark, is waterproof and a bottle of it will keep the brush filled for a long time.

  3. 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

  4. It’s okay to use the Ultradraw. The Ultradraw ink is made for Rapidograph pens and I’ve been using it for years with no problem. Just don’t use something like Speedball ink or an india ink that’s made for use with brushes. The Ultradraw doesn’t clog/gum up like the others. Sorry I can’t be more science-y as to why, I just know it works–despite what’s on the label 🙂

  5. 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.

  6. 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?

  7. I’ve never used the Universal India, but the ultradraw is jet black. When I dip a brush into speedball ink (which is rarely black these days) and use it alongside the Ultradraw there’s a noticeable different. The ultradraw makes for a nice, smooth black fill.

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