Save your hassle and no need to stir your metallic inks while writing! 
Pretty and portable magnetic stirrer that comes in a gift box including:
Traveller pouch
One large and one small stirrers
A glass bottle
 
Requires 2 AAA batteries (not included in the package)
Spinning speed: 600rpm -2400rpm
Duration: 7-10 hours depending on speed
 
Purchase extra stirrers here and bottles here if you need.
You can also use any bottle of similar size with base no larger than 40mm diameter.