In textiles, lustre or luster is a physical property that makes them appear bright, glossy, and shiny.
[1]: 73 Factors affecting ''lustre (the way light reflects)'' lie with fiber properties, but various processes can also alter the surface of textiles and transform the fabric luster.
The rounded edges and triangular cross section of the silk fiber contribute to its luster properties; in some cases, synthetic fibres mimic this trilobal shape for a silk-like appearance.
[6] Other than fiber structure, it is chemical orientation and different finishing methods such as singeing, heat-setting, calendering, silk surfacing, mercerizing, and bio polishing, etc.
[1][3]Scattering and absorbing light tends to cause the fibre to appear duller because of the delustrating additive, such as titanium dioxide.