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Fresh Garlic Turning Blue/Green when baked??

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So I made a white pizza the other night, chopped 2 cloves of garlic in the food processor & sprinkled on the pie. I baked it for 10 minutes on 450 as the pizza crust instructions said. When i took it out, they minced garlic became a shade of blue green sprinkled throughout my pretty white pie :( Apparently when my husband re-heated a slice, it became more blue-green according to him.

Any ideas why this happened or if it's normal?

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  1. It is normal, it means your garlic is quite fresh and just a touch immature. The sulfur has found some copper to react with, making copper sulphate, which is very blue. It's safe to eat.

    Blanching the garlic - like anything else, quickly heat, say 30 seconds in boiling water and cool in ice water - would probably prevent this. I suppose a quick saute would work just as well, might be more appropriate.

    Some sources recommend using a canning salt, rather than iodized, as well.

    1 Reply
    1. re: HenryT

      I thought copper sulfate was pretty bad to ingest...kinda a poison?

    2. I sautee my garlic in olive oil until it becomes almost translucent....this usually keeps it from turning blue/green.
      A throw in a dash of Kosher salt...this will help enhance the flavor!

        1. Garlic can turn blue/green when exposed to acidic ingredients.

          1. wow, who knew? Thanks for all of your insight and the other links!