This ink was purchased along with a TWSBI ECO Smoke and Rose Gold pen (Med). Delivery of items was 3 1/2 business days from order to receipt of items... Thank you!
This ink now replaces my Parker Quink Blue/Black ink and is used for everyday notes and journaling.
What I have found is that this ink comes out of the pen really light in colour but when it oxidizes, evolves to a darker shade (almost Navy but with a more black tone ). Dried colour is similar if not same as the Parker Quink but that could be just me and my unrefined tastes... Dry time seems to be a little quicker than the Parker ink ~10 seconds less. Stays fluid even if pen is uncapped and not in use for >1 min - no need to touch the tongue to get it going for this situation however that could be just the way the ECO is design to feed. No observed bleeding and see through is non-existent (Moleskine A5 hard cover note book). The real test will be when I start writing on the Leuchtturm paper.
Overall I am finding this ink pleasant to use in the ECO and will try it out in my Safari after a good soak and several flushes in distilled water. So far I am extremely impressed by this ink and will likely stick with it for daily use.