Are the silk products bought by the tour guide when traveling in Hangzhou real?

Silk of different qualities can be correctly identified from the following five aspects:

Appearance

High-quality silk has a pearl-like color in appearance and is sensitive to light. Has diffuse refractive properties. It is clean and has few impurities, and the silk path is orderly and tidy; while poor-quality silk often has a pale appearance, lacks luster and moisturizing due to the addition of bleach and other chemicals, has more impurities, and the silk path is messy.

Touch

High-quality silk feels smooth, smooth and elastic, without hard clumps; while inferior silk feels rough, inflexible, and moist, and may cause cocoon stems, cocoon blocks, and raw cocoons. There are relatively many slices and pupae.

Taste

Silk with an oily or musty smell is inferior.

Combustion

Silk has no flame retardancy when burning and stops burning when separated from the flame. After burning, it becomes loose ash with a smell of burnt hair.

Fiber strength

The better the stretchability of silk, the better its quality. Research shows that the tensile force that special grade mulberry silk can withstand should be stronger than that of iron wire of the same diameter. High-quality silk has excellent recovery elasticity; while inferior silk has poor fiber properties such as strong elongation and recovery elasticity.

The above information comes from the Internet