Lecture bottles should be properly labeled to ensure safety and prevent any potential accidents or confusion. Proper labeling helps to identify the contents of the bottle, their potential hazards, and necessary precautions. This information is crucial for anyone handling or working with the bottles, including students, teachers, and lab technicians. It helps to minimize the risk of mishandling, accidental mixing of incompatible substances, or exposure to harmful chemicals. Therefore, it is important to properly label lecture bottles to maintain a safe learning environment.