An employee was working in a research lab with a waste bottle containing 5% thiosulfate and trace amounts of other chemicals including silver nitrate, ammonium nitrate, and residual chemicals from earlier protocol steps. The bottle burst open from the bottom and its contents spilled out through the fume hood and via the partially open stash into the lab. The employee was standing right in front of the fume hood when this occurred, exposing her face, eyes, and neck to the spill. The employee was hospitalized due to chemical burns to her eyes, lips and tongue and to monitor her airway.