The Alchemy ink range from Endless holds a generous amount of ink, with a bottle shaped like a beaker it has a rounded base, offering the perfect fidget spinner or, more practically, it allows the bottle to tilt so the ink pools in one corner so you can get every last drop of ink. As well as inks Endless also make some pretty unique pens. The Captiva has a handy system where you can refill the pen with an ink converter, for use with bottled inks, without having to remove the barrel or converter.