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In page Aqua Tofana:

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The active ingredients of the mixture are known, but not how they were blended.[citation needed] Aqua Tofana contained mostly arsenic and lead, and possibly belladonna. Belladonna is a flower, which was commonly used in cosmetics at the time to enlarge pupils. It was a colorless, tasteless liquid and therefore easily mixed with water or wine to be served during meals. Its tasteless properties signify that it was made with a deliberate attempt to hide the potent metallic taste of arsenic.[1]