Special lighting

Very small particles of dust are not usually visible to the naked eye. However, if we use special lighting techniques we are able to see them.

• In this image, special lighting and photography have been used to show the plume of dust that is made when this stonemason chisels a stone block.
• Some of this dust could not otherwise be seen.
• It also shows how even when an extraction vent is in place some of the dust can escape.

• In this image, a strong light beam reveals the airborne dust that is created by this worker shovelling grain.
• Normally, this dust would be almost invisible. In this situation, you cannot use water to suppress the dust, as it will spoil the grain.
• Full respiratory protection should be used, with a well-fitted, filtered respirator.