Last month I had my first encounter with KWZ Ink. My impressions of the iron gall inks was mixed: the iron gall green #3 I really liked, the iron gall red #3 a lot less. The IG turquoise is the third iron gall KWZ Ink I tried. Fresh on the paper and in the bottle it might look like a turquoise, within seconds it's far more dark and in my opinion this is more a teal than a turquoise. A modest, nice color for both professional or personal purposes. The ink is well behaved, a bit more prone to feathering than other KWZ inks than expected. Shading is low to moderate, show-through minimal. The ink is not too wet, writes smoothly and drying times only a bit above average. Water resistance is OK, be quick and there won't be too much damage. The color is not unlike Iroshizuku's Tsuki-yo. Both are more blue than Emeraude de Chivor (Herbin) and Syo-ro (Iroshizuku). All is all this is a decent ink in a nice modest color, for a good price. There is only one problem,
Fountain pen ink reviews and comparisons. Because there is so much more than cartridges with blue, black and blue-black. Opinionated, un-scientific, infrequent, and independent.