Ultradraw and Universal are probably THE technical pen inks in North America. Staedtler makes a great ink but it is only available for high prices in small little bottles (same with Eon Abyss). Ultradraw has a longer drying time than Universal and feathers a bit more on certain papers (e.g., Strathmore 300 bristol). Neither ink is as black as some of the fine art inks like Talens drawing, Talens india or Sennelier china. However, the Koh-i-noor inks are matte and good for scanning/photography. I find it a bit thin for brush work, but in a dip pen it is free flowing and expressive, provided you have a paper that can take it. For film, use rapidraw instead. It's not a cheap ink, but buying the 8oz gives it to you at $3.00 per oz. Just wish that DEW carried the 32oz size and the other colors. Shelf life appears to be quite long.

This is great ink to use with your Rot-ring drawing pens. Lightning fast delivery!

My order was filled promptly. It's good to have a ready source of this ink.