Comparing to quality level 4 and 5, the products quality level 2 and 3 are also filled with the natual silk fiber, the difference is the quality level of the silk

fiber filled.It is a deception of using shoddy as quality products.It is more difficult to tell its difference from the top grade silk duvet filled with long strand

mulberry silk .
We can tell the difference through touch, smell and appearance, which need high reqirements and experience.Some products may need professionals to tell the difference.
1,Touch: you can touch the silk duvet, the natural silk has sense of draping, rather than fluffy.If possible, you can touch the inner side of the duvet and pull the

fibers filled in the duvet, if the fiber is not so easy broken,the fiber is the mulberry silk fiber which is the long strand fiber more than 100cm. If not, the fiber

may be tussah, which is short stand fiber, commonly only about 20cm. The long strand fiber is more durable and no need to be remade after several year’s use.

2,Apperance: High quality silk is clean and neat with little impurities. It has a pearl-like luster appearance,which produce diffuse light reflection under the light.
The poor quality silk is in pale color, lake of soft and lenitive luster,more impurities and orderless.

3,Smell: As the silk is an animal fiber, therefore silk products emitt special smell of silkworm. Through the holes, You can identify the silk filled by smell. Duvet filled with top grade natural silk fiber has a special aroma of silk. If the silk duvet smell with an oily smell or musty odor.The silk filled in the duvet is inferior.

Special Zone for Silk filled Duvet in one Shanghai Supermarket