RotringIsograph Technical Drawing Pen, Liquid Ink, 23 ml, Black

this is the best ink for radpidograph or Kolinoor -- tried and tru

Used this stuff for years. No problem.

Nice product. Was what I expected.

I've tried the ink in the pen, and so far it appears to fulfill the requirement. However, while the package (cellophane wrapped with a holograph sticker) appeared to be new, the bottle itself was insecurely sealed, and stuck with dried ink to the inside of the cardboard box. This made we wonder whether the product was indeed entirely rOtring factory produced.

Well, it works well was easy to put into my pen with no mess involved, the ink dries fast, which is what I need for my art

Precisely what we needed. Thank you.

First off my concern with this product because of its price was that it was a fake. I was relieved to see that is has the original Rotring seal on the box. I ordered the ink in preparation for a new Isograph pen. The ink gave me no trouble and it activated with the pen quickly. It is waterproof for my art and a lovely rich black. I plan on trying the other colors in the future.

The ink is really good quality in my opinion. It dries pretty quick, it doesn’t smudge or smear. And it’s a nice dark ink, that is very prominent. Also it has yet to fade any that I can tell. Definitely recommend if you are looking for a good ink.