Hoping not to break the forum rules, I recently purchased a sample of what some call the brightest blue ink available from the Tardiff stable of inks. Concerned over staining threats.... I have and really like my Kaweco Ice Sport. I have modified one of its cartridges so I can refill it with any ink I choose, via a needle syringe (works great). I was thinking I could try the BSB in that cartridge and if it becomes uncleanable, no real loss. However, am I creating an issue with the Kaweco's feed? Lookin to use the ink to see what all the commotion is! Thanks ...