07-16-2016, 02:16 AM
I use a Pentel Pocket Brush but never needed to buy cartridges. Just get some india ink and suck more up into the pen like and eye dropper. Also Faber Castell pitt artist pen cold grey 230 are great for doing really light washes of tone. Good for laying in silhouettes and going over with lines. Dont get hung up on getting the perfect pens though. "The bad carpenter blames his tools". Just use a ball point and GIT GUD.