DefinitionOxalic acid is a poisonous, colorless substance. This article discusses poisoning from swallowing oxalic acid.This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.Poisonous IngredientOxalic acidWhere FoundOxalic acid may be found in some:Anti-rust productsBleachesMetal cleanersRhubarb leavesNote: This list may not be all inclusive.SymptomsAbdominal painCollapseConvulsionsKidney problemsLow blood pressureMouth painShockThroat painTremorsVomitingWeak pulseHome TreatmentSeek immediate medical help. DO NOT make a person throw up unless told to do so by Poison Control or a health care professiona