For ink pens that won't write; place the pens upside down in a cup of hot water until the water cools off. Wipe dry and use.
Source: My husband does this and it works very well.
By Monica from Cortez, CO
Sometimes there is plenty of ink left, but the marker tip has dried out. This is a page about reviving dried up markers.
General consensus seems to be that the best way to jumpstart a gel glitter pen is to bounce the tip on a hard surface. Shaking it can also get the pen working. This is a page about a new gel glitter pen not working.
This is a page about reviving ball point pens. One way to get the ink flowing in a clogged ball point pen is to apply heat to the tip. Here is some information to try before you throw that pen away.
