Lightfastness
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Lightfastness is a property of a colourant such as dye or pigment that describes its resistance to fading when exposed to light. Dyes and pigments are used for example for dyeing of fabrics, plastics
Clay earth pigments such as burnt sienna often have a high lightfastness
Side of a sign of the University of Applied Sciences oriented towards the southeast where direct sunlight impacting from dawn to afternoon has bleached the red and yellow colors from the logo of the institution.
Side of the sign oriented towards the northwest where the red and yellow colors can still be clearly recognized.
Earth pigment
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Earth pigments are naturally occurring minerals that have been used since prehistoric times as pigments. Among the primary types of earth pigments include the reddish-brown ochres, siennas, and umbers
A range of pigments were mined by Indigenous Australians at this Ochre Pit in central Australia.