Got said ink some time ago and I've always struggled to get it to flow after a day... Tried different pens, nothing... It was so bad I realized I wasn't even using the ink and I started looking for alternatives (blood red, although I'd like to get Diamine's Poppy Red too). Then I decided to clean the pen with a bit of dishwasher liquid, letting it soak for a night, and give it a final go by trying to write every day, even if it's a single line... Lo and behold, it hasn't skipped for a whole week... This is probably obvious, but I thought I'd write this for those of us with less patience... There's still a lot of gunk but it hasn't even skipped once, I'm amazed. Still just might get that Poppy Red for another pen though.