If your olives get exposed to air, they can develop a white film. It is the healthy lactobacillus probiotic bacteria from the fermentation process. It is perfectly normal and safe to eat. In fact, it helps you digest food. You can simply shake up the jar or scoop it off the top if it bothers you, but no matter what, don't toss out those delicious olives!
Check back soon for a post on why fermented foods are so good for us!
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Thank you for the information on the white stuff in my kalamata olives. This is the second time I used them taking off the white stuff. I was a little concerned but figured since they’re in a sort of brine they are probably preserved. Glad I didn’t throw them out.