The ball in the cartridge is called an "Agitator". Its purpose is to break liquid tension when the ink gets stuck at the top so that you don't get a break in ink flow.

Hey Elliot I've been using the Rotring Rapidograph ISO pens for years and have been happy with them. Also the ink cartridges for those have the blackest ink I've ever used. Much darker than the carbon ink and it's waterproof.

Elliot I do like this type of content, keep up the art tool reviews.

Glad to see you back livestreaming.......there has been a notable lack of jerk-mongering in your absence!

Rotring been around for ever in Europe. High tech pens. I personally love this art calligraphy pen because of balance and light weight, used them since 35 years back. Not sure if they still make these.

you referring to the red ring, which in fact is the name brandname -'rotring' wich means red ring, I have several rotrings-art pens. I like the 0.9 the most for drawing.

The one I bought has some sort of fault straight from the Factory. I have the exact same one, EF on the cap. It is trash. So I stick with my Fine liners and Lamy Safari (great pen)

love it that you call ROTRING - ROADTRAIN :D

Good, can't wait for DOOMKICKER.

only now discovered this interesting video. You can put a second cartridge in the pen, back to back with the one that is in use. If one is empty, you just swap.

Rotring Drawing Ink is waterproof (it could not possibly be anything else) and takes less than 30min to dry up obviously depending on the material being used

Hey Elliot! Good to hear you're interested in fountain pens. I got into them about a year ago myself, for a couple of reasons: I was sick of cheap, dried-out ballpoints for writing, and I was curious about the discontinued Koh-I-Noor art pen that Stan Sakai has hoarded. So I've been looking at fountain pens, on and off, for drawing and inking, and the waterproof inks that can be put in them. One of my first buys was one of these: an extra-fine Rotring art pen. Have to say I was pretty disappointed in it. For one thing, the extra-fine nib is _huge_ compared to the way and what I use to draw. German nib sizes skew that way, apparently. For properly fine and extra-fine nibs, japanese pens look like the way to go. Also, like you say, there's no thick and thin in the line. No spring, no flex; it's a 'nail', as they say in pen circles. That was a big disappointment to me. It was little different to drawing with one of the fineliner pens I've used since I was a kid - except a bit 'fancier' because of the _look_ of the nib. Not enough. I've known about the Platinum desk pen that carbon ink was designed for, but never got around to buying one despite the cheap price. Instead I jumped on the limited run of 'safety' pens made by Noodler's. A kind of pen suitable for india ink because the nib and feed can be retracted into the body, immersing them in the ink reservoir and preventing them from drying and clogging. Trouble is, everything else clogged. The carved screw threads in the retracting mechanism couldn't cope with the amount of wrenching needed to get it to actually retract or extend. The nib, a flexy thing from their Creaper pens, was better than Rotring, but still chunky, and no other dip nib I tried would fit and allow a good flow of ink. I actually ruined the nib and feed a couple of weeks ago, trying to pull the pen apart for cleaning. The rest of it is still soaking in a sonic cleaner. Dunno what I'm going to do with it. Pity, because apart from nib troubles and getting the bleedin' parts to move, it did keep the ink wet, and was nice for drawing. I probably should've gone straight for the Platinum pen, or put some carbon ink in a cheap Creaper, but instead I backed the IndiGraph pen on kickstarter. This one's supposed to keep india ink wet with a water reservoir in the cap. I hope it works, and that I can swap the nib for something more flexy, because this pen mania is getting expensive...

I think most waterproof fountain pen inks are not immediately waterproof. Like, you have to wait like a half hour or more and then it becomes completely waterproof.

You can put another cartridge in it

I have this pen and also the Lamy Safari. Although the Safari isn't sold specifically as an Art pen, but compared to the Rotring, imo the Lamy Safari is better. Btw They are both in the same price range too.

Could you review this one, the "f" and 1.1 sizes?!? All side by side. Thank you.

Do it! Make more "pen" videos, types of ink you prefer ect. People are interested in this stuff it's good content and when people ask you can just tell them you have a series of videos on KZfaq explaining it and point them to your channel instead of explaining it to everyone who asks. Maybe do the next vid one on Pentel brush pens since you use that one alot.

I believe you can get a converter to put in your own ink if it not being waterproof bothers you

So which ink/pen you recommend which is waterproof ? I love roterimg but the ink is not waterproof.

That's a nice looking pen! Have you seen their drafting boards? Mitch Breitweiser bought a sweet set up from them a few weeks ago. It makes drawing perspective grids a snap

You could try Staedtler Mars Matic ink. I use it to recharge everything. Brush pens, Sakura markers, everything. And it dries waterproof

Get the converter then use your ink of choice

What paper do you use with Fountain pens ? T.i.a.