Long sleeve shirts are prefered, but short sleeves are acceptable. The idea is to minimize exposed skin to protect from chemical spills and broken glass. Loose clothing, including scarves, ties, open sweaters, baggy cuffs, etc., should not be worn in the lab. These can catch fire or knock over vessels. Loose, long hair should be tied up in the back.
Hair burns very easily.
Don't touch hot objects. Smoking, eating and drinking are not permitted in the laboratory. Persons not taking the class are not permitted in the laboratory. Horseplay is forbidden. Lab waste is to be disposed of as described by the instructor.