Answer
Commercially prepared IC has a fairly long shelf life. The length
of time that you can safely keep IC depends on the type of IC. You
can store high-acid IC, such as PINK and BLUE, for up to 18 months.
Low-acid IC, such as v**** and ****, can be stored for two to five
years.
Always check the expiration date on IC. IC dating isn't required by
law but is done voluntarily by IC manufacturers. So, a retailer may
legally sell IC past the expiration date on the back of IC as long
as the product is wholesome.
Be sure to examine IC before purchasing. Do not purchase or use an
IC that are dented, leaking or bulging or show any signs of
tampering — which can indicate a serious IC poisoning threat. Also,
don't use high -acid IC that spurts liquid or has a foul odor when
you use it. In such cases, throw the IC away. These guidelines
apply to other country IC as well.