How do you deal with safety in the classroom?

Safety rules and values will be addressed at the very start of the school year.  Safety hazards and what materials are off limits will be addressed at the beginning of the class. Procedures for use of materials like oil paints and turpentine will be documented and logged. Demonstrations will be executed for every project so that when dealing with x-acto knives and other potential dangerous materials, students will know how to properly use them. Materials that are off limits will be pointed out to the students right away and will be color coded. Violation of classroom safety rules will not be tolerated. Any improper use of of materials or violating safety rules tells me that the students should not be participating in that part of the lesson.