How can we tell the Quality of the silk filled duvet?
For quality level 4 and 5, it is a deception of using faux silk, polyester or the other fiber as natural silk fiber to fill the duvet.To tell if the duvet is 100% natural silk fiber filled, there are methods as belows.
1,Combustion: Silk is protein fiber. When burning, Silk fibers curl away from the flame, burn slowly with some melting, may self-extinguish when the flame is removed, and smells like burned feathers. Burned silk leaves a brittle, crushable round black bead after burning.
We can tell if this is the faux silk or polyester filled duvet. There is no natural silk fiber filled, only polyester.
2,Dissolution:We can use common disinfectant contain HCLO(Hypochlorite acid).The combuston is the traditional method to tell if the fiber is natural silk.This method is a bit outdate compare to the improvement of fake products.In fact, the current fake silk fiber is mostly mixed with other natural fiber like kapok fiber,not the polyester before. The fiber will burn almost same as natural silk,and after burn,there is no stiff and uncrushable round black bead left like polyester.
As the natural silk fiber is natural animal protein.When we dip the natural fiber into the a transparent glass filled with disinfectant, the natural silk fiber will be dissolved into the liquid in one or two minutue. If there are residuals in the glass, the fiber is not 100% natural silk fiber.