How was blood stored in world war 1?

During World War I, blood was stored using glass bottles or jars, often with anticoagulants like sodium citrate to prevent clotting. Blood was typically collected from volunteers and transfused directly, as there were no blood banks. The challenges of transportation and storage meant that blood was often used quickly, necessitating the development of more advanced methods in later conflicts. This period laid the groundwork for modern blood banking practices.