In general light shades for coloring surfaces are recommended in factories. However for the sake of contrast machine with moving parts should be painted dark ( preferably red) to distinguish it from stationary parts of the machine.

Safety color codes are helpful for identifying physical hazards. The workers become aware of the probable hazards present in their industries through the application of safety color codes. OSHA ( Occupational safety and health act ) envisages a hazard color code by which one can distinguish between various sources or types of hazards.

Each color in indicates a specific purpose as follows:

1. Red : Fire prevention and fighting.

2. Orange: Those points of machinery which could cause injury.

3. Yellow: General cautions as for example against falling etc.

4. Green: First aid equipments personnel protective equipments as for example gas masks etc.

5. Blue : Caution or warning against stating of equipment under repair as for example lifts.

6. Purple: Radiation hazards.

7. Black white or combination of Black and White : Housekeeping and traffic locations as for example stairs waste boxes and drums.