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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
In this image, a strong light beam reveals the airborne dust that is created by this worker shovelling grain.
Updated 2019-11-12