Cerium oxalate

It is a white crystalline solid with the chemical formula of Ce2(C2O4)3.

It could be obtained by the reaction of oxalic acid with cerium(III) chloride.

[2][3] It has been identified as part of the invisible ink that was used by Stasi operatives during the Cold War.

Oxalates are corrosive to tissue and are powerful irritants.

They have a caustic effect on the linings of the digestive tracts and can cause kidney damage.

NFPA 704 four-colored diamond Health 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gas Flammability 0: Will not burn. E.g. water Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium Special hazards (white): no code