This is considered to be the best silk in the world, which is down to its strong weave that can withstand heavy dyeing. There are types of silk as it happens: rough and smooth. The functionality of two differs – the smooth one has rather a lustrous silky feel to it and is more apt for clothing and interior designing. On the other hand, the rough one is more suited to curtains, blankets and table runners. If you don't want to fall prey to polyester imitations, there are two methods that would tell which is real silk and which is not: if you burn a piece of Thai silk, it'll burn the whole thing away reducing it to nothing but ash, but fire has a different effect on polyester, when burning, it will emanate a black smoke, and even when the flame is out, it will keep singeing.