Barium perchlorate hydrate is primarily used in pyrotechnics and fireworks due to its ability to produce bright green flames. It serves as an oxidizing agent in various chemical reactions, ensuring efficient combustion in pyrotechnic compositions. Additionally, it is employed in the preparation of other perchlorate compounds and in specialized laboratory experiments where a strong oxidizer is required. Its hygroscopic nature makes it useful in applications requiring moisture absorption. However, due to its potential hazards, it is handled with caution in controlled environments.