ANSI Color Codes
| Colors | Use Case |
| Red | Fire protection equipment and apparatus, danger signs, containers of flammable liquids, lights at barricades, stop buttons/switches |
| Orange | Signs and equipment designating dangerous or energized machines/equipment |
| Yellow | Specific physical hazards including falling, tripping, and striking and designating caution |
| Green | Safety information and first aid equipment |
| Blue | Information not immediately safety related (ie. property policies) |
| Purple | The significance of these colors may be defined individually within the context of the job. |
| Grey | |
| Black | |
| White | |
| Combinations of Black, White, and/or Yellow |
Andon Light Stack Color Codes
| Red Status Light | The machine or process has been halted. This could be because of a quality problem or a mechanical issue. This is a call for help and a problem will need to be solved before the process restart. |  |
| Yellow Status Light | Warning signal. The machine or process may still be running. But trouble is on the horizon. The yellow light is a warning that there is a problem that should be solved quickly before the problem becomes critical and the process will be stopped. | |
| Green Status Light | Everything is running well. The machine or process is under control and no action is necessary. | |
| Blue Status Light | The blue status light often means that a potential quality problem has been detected. The problem may not have fully developed to the point that the red light needs to be activated. But the problem needs to be solved quickly before it escalates. | |
| White Status Light | The white signal light is often used to signify that a production run has been completed or there may be a shift change. This is an indication that a process has stopped for a legitimate reason. |