FIRE DIAMOND. People often notice a colored sign on a building called a fire diamond. Fire diamonds located on tanks and buildings indicate the level of chemical hazard located there. The four colors are blue, red, yellow, and white. The numbers superimposed over the colors rank the severity or danger, ranging from one to four, with four being the highest rating.
Minors aged 14 and 15 can work from 7:00 a.m. until 9:00 p.m. while 16- and 17-year-olds can be employed between the hours of 6:00 a.m. until 10:30 p.m. (11:30 p.m on Friday or Saturday or when not regularly attending school) for up to 48 hours per week of school and work combined.
Each Native American tribe may establish its own minimum gambling age (but not less than 18 years of age). All commercial casinos in Detroit have a minimum gambling age of 21, as required by Michigan law. The Michigan Bureau of State Lottery and Office of Racing Commissioner (horse racing) have a minimum age of 18.