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| | Calcium oxalate - Wikipedia, the free encyclopedia |
 | | They contain calcium oxalate, a compound derived from oxalic acid, as well as enzymes which trigger the release of antibodies called histamines in the bloodstream of persons who ingest the leaves. |
 | | Oxalates are needle-like crystals, which, when eaten, may pierce the mouth, throat and digestive tract as they pass through, causing, at the very least, intense discomfort. |
 | | Calcium oxalate also forms a major component of beerstone, a brownish precipitate that tends to accumulate within vats, barrels and other containers used in the brewing of beer. |
| en.wikipedia.org /wiki/Calcium_oxalate (379 words) |
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