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I would say it's probably more of an esthetic thing. Black olives wouldn't look appetizing in a jar with all the black liquid in it.

Many green olives are either naturally fermented or acidified and do not require a metal can. Most black olives are a low-acid food and require a higher heat canning process - which is more easily accomplished in a metal can.

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Q: Why do black olives come in cans while green olives come in jars?
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Why are green olives sold in clear glass jars and black olives sold in cans?

Because the part where oil comes from so they make olive oil in bottles. Olive oil comes in glass botles, plastic bottles and metal cans. It all depends on the quality and the way the seller of the oil want to present the product. Olive oil in glass bottles is usually more expensive.


Why do you crave green olives?

More than likely, it is to help stabilize their color. UV exposure might turn them grey. Besides, they are unattractive to look at, especially since an iron solution is added to help stabilize the color. It is similar to why cherries are packed in cans of colored syrup.Answer:The process for making black olives results in the olives being packaged in a non sterile solution that may allow them to become contaminated with botulism. To prevent this from happening (it's bad for business to have your customers die), the olives are cooked in sealed containers. Glass jars cannot withstand the internal pressures generated by the cooking process and the olives must be cooked in metal cans.


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