Olive oil has been used for a long time as a major ingredient in the soap making process, with it's anti-oxidants and overall health benefit no wonder why olive oil would be essential in soap making. Different cultures and people from all over the world use olive oil to cook with it's alarming that when you go to your grocery store and pick up your favorite bottle of extra-virgin olive oil it may not be what you are seeing on the label. Did you know that over 70% of the world's extra-virgin olive oil isn't what it say it is. It actually lacks authenticity lots of olive oil gets imported from other places and relabeled as "extra-virgin" olive oil. For instance, Spanish olive oil is being passed off for Italian by changing out the label on the bottle. We also have olive oil that's being mixed with other cheap carrier oils, labeled and landed in your favorite grocery store for purchase with a very expensive price tag.
Unfortunately in the case of Olive oil its difficult to guarantee it's authenticity the olive oil industry is a 1.5 billion dollar business and the fake olive oil is especially booming for scammers. A few months ago in Italy and Germany there was over 150,000 liters of low quality olive oil leading to 20 arrest. These low quality oils are being marketed all over the world as "fine Italian oil" making the fake olive oil industry a successful one for scammers, its believed in Italy and Germany the business is about 9 million yearly.
Ok I know you must be wondering what's real and what's fake there are a few ways to test to see if the olive oil you purchased is as authentic as it claims to be. Despite popular belief color actually isn't an indicator of its realness. The oils worth checking out are the ones in darker glass bottles which protect it from going rancid from sun exposure. Also, make sure that the expiration date is printed on the bottle and watch out for any phrases like "packed in Italy" or "bottled in Italy. If your looking for an olive oil workaround sunflower and safflower are great alternatives.
Olive oil has great benefits for soap making as it contains 80-82% olec fatty acids which helps the moisture of the lather. Both oils contain 81-85 olec fatty acids which is no fundemental difference when you substitute either of these oils for olive oil. The final product's quality is unchanged with no concern about realness.