This is Kaweco Paradise Blue ink that I used in two Kaweco Sport pens when I tested them. My review for the Kaweco Chess Sport pen is Here. I used bottled ink and fitted the Kaweco Chess Sport with a 1.1 nib. I also used a cartridge in an ART Sport in Lapis Blue fitted with a standard F steel nib as a comparison. This ink looks much more saturated with the 1.1mm nib, as you would expect. Paradise Blue is a turquoise ink that leans more towards the blue/green end of the colour spectrum than the green end. It is a really well behaved ink and I can highly recommend it as a top quality ink. You might still find some older bottles of Kaweco Paradise Blue ink. The two inks are a very similar colour. However, you can tell if you have one of the newer bottles because the name of the ink is now printed on the box. It's also on the cartridge packs. New Paradise Blue bottles and cartridges come in differently coloured blue packs than the older ink, and cartridges now have Kaweco branding on them. This ink isn't waterproof, and it doesn't stain fingers. Sorry but I forgot to do the water test on the form before I scanned it. So I did it after scanning. Kaweco ink is made in Germany. It is readily available in 30ml bottles or packs containing 6 standard international sized cartridges.