Most black olives started out green
Audio from the Clean Food Score video of the same name; the video shows the labels and scores on screen.
Canned black olives are picked green, then darkened with air and an iron salt. Here's how Kalamata and Castelvetrano differ, and the clean label to look for.
Full guide and the products we checked
Check any ingredient list free
Products featured (Amazon links, with our 0–100 label score):
• Kosterina Spicy Kalamata Olives — 71/100
As an Amazon Associate I earn from qualifying purchases.
Product scores are Clean Food Score's 0–100 label scores as shown on cleanfoodscore.com on 2026-10-18. Recipes change, so read the package you buy. We read labels; this is not medical advice.
"Reminiscing" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
creativecommons.org/licenses/by/4.0
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