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I have these with my Kaweco Sport pens and they're marginally better or perhaps it is that the classic Blue/Black is a perfect hue . No connection to the company: https://www.theonlinepencompany.com/diamine-ink-cartridge-1864-blue-black-pack-of-20
skipper
Are all ink cartridges equal?
I got a Kaweco Brass sport for my birthday and it's a pleasure to write with, it only came with 1 ink cartridge, so need to stock up.
Should I stick with Kaweco ones, or are any acceptable?