This term made popular by catalog-centric websites is a misnomer. Art Silk in the technical circles, is a synonym for rayon.
However, now art silk is a euphemism for the articles made in polyester, nylon or acrylic.It is also known as polysilk.
One can find out the difference between the real silk, rayon and the "art silk" ( nylon, polyester, and acrylic) by burning a small yarn from the fabric and identifying the bead and smell.
See Also
Fiber Identification of Man-made fibres
Fiber Identification of Natural Fibers
However, now art silk is a euphemism for the articles made in polyester, nylon or acrylic.It is also known as polysilk.
One can find out the difference between the real silk, rayon and the "art silk" ( nylon, polyester, and acrylic) by burning a small yarn from the fabric and identifying the bead and smell.
See Also
Fiber Identification of Man-made fibres
Fiber Identification of Natural Fibers