silk, rayon and silk satin identification

1, silk satin made by the Department of natural silk, silk-smooth surface beautiful, delicate touch, there is a sense of elegant, wearing gas-permeable, and does not feel hot;
2, rayon fabrics hard rough hand, there is a heavy sense of wearing a hot airtight.
3, silk satin water after drying, shrinkage greater 8% -10%; and rayon fabric shrinkage small, only about 1%.
4, after the use of fire, not the same as the effect. Silk fabrics with the smell of protein after the fire, rubbing his hands about the state of ashes powder; rayon fabric fast flame burning, no smell after the fire blew out, and then touch you, there is node lumps of fabric.