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I think I'd be pass on that one too, but hibiscus extract is not mercury chloride, cinnamaldehyde is not mercury chloride, lactic acid is not mercury chloride, vinegar is not mercury chloride, oregano is not mercury chloride, peracetic acid is not mercury chloride. I wonder how ethanol would work combined with one of the other methods that do not include mercury chloride.

oregano is not mercury chloride

Wait what? Oh man, I've been making my pizza sauce all wrong!