Technical Pen Black Ink - 0.85 fl oz / 25 ml | Waterproof Drawing Ink | Refill Pot Compatible with Rotring Isograph Pens | Plastic Bottle & Screw-On Lid | Ideal for Drawing & Calligraphy

works like a champ.

Very recommended, my best best silver inking method

Box says Liquidraw as brand, but bottle says Technoart. Probably the correct product because both have a similar crosshair emblem, but strange nonetheless.

This is my go to ink for my Rapidographs , and all my technical pens. I have used this brand for years I have only good things to say about it.

Use it often. Easy-to-use!!

Whats to say, its good ink.

Shook this well and it still clogged up a brand new Staedtler Mars Matic 700 in the 04 size. Unsure if I want to try it in anything else and see if it's the ink or the pen.