Crystal Barium Nitrate, Used in making fireworks, signal flare, explosives, optical glass, etc. Crystal Barium NitrateSPECS: Main content: 99.3% minMoisture: 0.05% maxWater insoluble: 0.05% maxIron(on Fe basis): 0.003% maxUsage: Used in making fireworks, signal flare, explosives, optical glass, etc. Crystal Barium Nitrate