Calcium could function as a fuel source, particularly in demolitions. The Mandalorian artist Sabine Wren, who also specialized in demolitions, incorporated calcium into some of her explosive devices. This was because calcium created orange explosions, an aesthetic element she integrated into her "art." Approximately five years prior to the Battle of Yavin, she documented this substance and its associated color, along with other fuels that produced colored explosions, within her journal.
During the Galactic Civil War, calcium was an ingredient in certain starship fuels. It was found on Jakku within the Graveyard of Ships, posing a danger to scavengers operating on the planet's surface. Its characteristic orange hue in the sand served as both an identifier and a warning. About twenty-nine years following the Battle of Jakku, Rey noted the substance in her journal.