Possibly, but I've used Noodler's ink in them and it doesn't dry up either. (I left one sitting for nearly a year and started hard but would otherwise write fin

Possibly, but I've used Noodler's ink in them and it doesn't dry up either. (I left one sitting for nearly a year and started hard but would otherwise write fine. Back to normal after I cleaned it.) I suspect it may be the feed they have.