How do you deal with safety in the classroom?

I believe it is important to take precautionary measures in the classroom. It is best to prevent an accident before it happens.  At the start of the year, walk students through the classroom and point out potential safety hazards and explain how to avoid them.  All materials in the classroom must be safe for students to use and age appropriate.  The classroom should have posters put throughout the room to deal with accidents that will happen, such as how to use an eye wash station.  Make sure students know how to use the tools and materials they are using effectively by demonstrating how to use it before they start a new project.  Also having a color-label system in the room to identify safe and hazardous materials could be useful.