I'm probably wrong but since it was discovered in a sacrificial pit I assumed the bronze age people burned the silk as a way to "communicate with heaven".
If you are buying a 'silk' garment it is common to ask the shop-keeper to hold it to a cigarette lighter to prove it does not contain a synthetic petroleum-based fabric, such as polyester.
If you are buying a 'silk' garment it is common to ask the shop-keeper to hold it to a cigarette lighter to prove it does not contain a synthetic petroleum-based fabric, such as polyester.