What are the effect of oxalic acid if taken internally?

Answer 1

When taken in a large dose, or in a concentrated state, it produces an intensely sour taste, heat in thethroat, a burning sensation in the stomach, vomiting, sometimes of bloody, at others of greenish-brown, or black, grumous matter. Collapse follows, pale and anxious countenance, cold clammy skin, &c. Convulsions sometimes occur before death.