Among this so-called trash might be buried treasure with a little TLC — some glass bottles ... olive oil is going to waste.

Time: Though that bottle of olive oil may seem like it will last forever, oil has a shelf life of about 18 to 24 months.

olive oil does not improve the longer it is kept and once opened it will begin to slowly deteriorate, so don't buy your oil in large quantities. Try to buy your oil either in dark glass bottles or ...

Another key indicator of freshness is bottle color and material. Light, heat, and oxygen are all enemies of olive oil, meaning your best bet is that the liquid gold is contained in a dark glass or ...