Pure Laboratory Grade Oxalic acid can react violently with things like alkali metals. It is also sensitive to heat.
Technical Specifications:
Oxalic acid has numerous chemical and physical properties:
It's colorless
It's odorless
It's a powder or granular solid at room temperature
Its crystals can have a pyramidal shape
Remarks:
Oxalic acid chemically showing colourful oxidation-reduction reaction occurs when potassium permanganate is mixed with oxalic acid. The reaction turns the purple potassium permanganate into a light brown colour.
Note: This article uses material from the http://rxmarine.com/