Barium nitrate is a colorless solid. It dissolves in water. It is an oxidizing agent. It releases a green flame when burned. It decomposes when heated to barium oxide, oxygen, and nitrogen dioxide. If it is heated in nitric oxide, it makes barium nitrite. It reacts with any sulfate or sulfuric acid to make barium sulfate.
Barium nitrate is very toxic. Sulfates can be given if someone eats barium, because they turn it into nontoxic barium sulfate.