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Rubidium was a substance that comprised certain starship fuels during the Galactic Civil War. Rubidium was present on Jakku in the Graveyard of Ships as a hazard to scavengers on the planet's surface. Breathing it in could be deadly. It possessed a purple color in the sand, identifying it and warning those of its presence.[1]
Sources
- Star Wars Rebels: Sabine My Rebel Sketchbook (First appearance)
- Star Wars: Rey's Survival Guide