The longevity of the ink depends on the pen, but most are about 6â8 months. If the pen dries up, you can try heating up the ballpoint part with hot water in case the rollerball is stuck. Another option is to keep the casing and purchase a refill for the pen. You can find ink refills online in the office supplies section of Shoplet.
Foot fatigue is a common condition that occurs after you stand or walk for long periods of time. The foot muscles become overly tired and cramp, causing the sufferer to experience pain and begin to limp.
1 Erythromelalgia is a circulatory disorder that can also cause burning feet. 2  Mechanical overload, especially if the patient is overweight and was standing up for long periods of time. 3  Reflex sympathetic dystrophy. 4  Fungal infection or Athleteâs foot is one of the most common causes of burning sensation in the feet.here are a number of reasons why burning feet occur. 1  Diabetes is one of the most common reasons. 2  This is because diabetes often results in polyneuropathies, especially affecting the extremities.