GJWC

A ferrofluid is made up of tiny magnetic fragments of iron put into oil.  The oil helps to prevent any clumping from occurring.  This particle is found in things that you may use everyday.  Some of these include DVDs, CDs, radio speakers, sensors and more.  Over time, this fluid will evaporate if not used.  Keeping it sealed tight will help to prolong the life of the fluid so that you can use it again.