Dust
Dust clouds usually appear tan in VIIRS Cloud Phase RGB. Dust clouds are usually semi-transparent. Its actual colour shade depends both on the dust cloud properties and the characteristics of the background.
tan
Bare soils and deserts
Bare soils and deserts usually appear brown or tan in the VIIRS True Colour RGB images.
Volcanic ash cloud
Volcanic ash clouds usually appear brownish or tan in the VIIRS True Colour RGB images.