- Real Silk has a slight resistance to it when rubbed between the fingers. If you feel polyester by rubbing it is always plastic-like and super smooth, even oily. Even though silk is soft and smooth in some cases, if you carefully rub it then you will feel a slight rope-like quality. It feels more natural and also drapes differently than polyester or rayon. Rayon is also a natural fiber; it is made from wood and also has that kind of natural woody feel to it. Anyway, it's hard to explain in words but if you take two scarves; one poly and one silk and compare you'll see what I mean.
- Real silk will turn into ash when burnt whereas polyester will melt like plastic.
- Real silk wears easier than polyester. If you find a vintage scarf that is very old but shows little wear then it's likely to be polyester because it lasts longer and doesn't degrade as easily.