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Oxalic Acid is an acid naturally present in many plants that we eat.
Oxalic Acid is present in very small amounts in chives, oca, parsley, rhubarb, sorrel, spinach and taro, and in even smaller amounts in a zillion other types of produce from asparagus to sweet corn.
It can make something taste tart, as it does in sorrel.
Nutrition
Oxalic Acid is poisonous in very large amounts.
It hinders the body from absorbing calcium and iron because it combines with them to form compounds called "oxalates" that our bodies can't absorb very well. But in small amounts, it is nothing to worry about it: our own bodies actually even make it, while processing Vitamin C.
The two main Oxalic Acid caveats regarding foods that you might possibly eat are:
- If you ever cook taro, always cook it properly;
- When using rhubarb, never, ever be tempted to eat or use the leaves. The Oxalic Acid in rhubarb leaves is so high that it is fatal to many people.
History
Oxalic Acid was discovered in 1776.
During WW1, Americans were encouraged to eat rhubarb leaves as a supplement to fresh vegetables, which added a few homefront casualties to the overall toll of the war.
Also called:  Ethanedioic Acid
See Also
Rhubarb, Sorrel, Taro
Other entries for Technical Terms
Accolade, Acetic Acid, Air-Layered, Alliumophobia, Alum, Alveograph, Ascorbic Acid, Best Before Dates, Biologique, Butyric Acid, Carbonic Acid, Carnauba Wax, Chocolate Bloom, Collops, Cracker Barrel, Cucina Casalinga, Cultivar, Deipnophobia, Dioecious Plants, Du Jour, Dunking, Etiolation, EU Designations, F1, Firkin, Free-Range Chickens, Free-Range Total Freedom, French Revolutionary Calendar, Gastrique, Gâte-sauce, Gomme Arabique, Hybrid, Invaiatura, Kosher, Lachanophobia, Lime (Chemical), Listeria, Lye, Mageirocophobia, Maillard Reaction, Open Pollinated, Ostraconophobia, Oxalic Acid, Pack Date, Pavé, Phosphoric Acid, Plant Variety Protection, Pome, Potassium Nitrite, Potluck Suppers, Punnet, Quinine, Rifilature, Scald (Fruit), Sell-By Dates, Sodium Nitrite, Stufatura, Sunday Roast, Traditional Free-Range, Turophile, Use-By Dates, Yatai, Ye Shi, Yearling, Yuuki
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