I went to Hangzhou two days ago and bought a T-shirt at Cocoon Silk in Hangzhou. It is said to be mulberry silk. I want to know if it is true or not.

Silk is protein fiber, which is known as "soft gold", "queen of fiber" and "the second skin of human beings". Silk is a kind of natural fiber, which is light, soft and delicate. Its main component is animal protein, which contains 18 amino acids necessary for human body. According to ancient books, silk has wonderful functions of chasing wind, dehumidifying, calming the nerves, nourishing and balancing human skin. The composition of natural silk is very similar to human skin, and it is the most "skin-friendly" natural substance, which is very beneficial to skin health. It can promote human metabolism, improve the vitality of skin cells, moisturize the skin and prevent skin aging. Its smooth, breathable, gentle, moisture-absorbing, non-itchy and antistatic characteristics are being respected by consumers who pursue nature and fashion. Identification of True and False Mulberry Silk (1). The color of silk is milky white, and occasionally there are thin cocoon pieces that have not been picked out. The shiny one is real. The color is pure white, and everything without thin cocoons is fake. (2) Touch by hand. Silk is thin and soft, and it sticks to hands easily. And those that don't stick to their hands are fakes. (3) nasal odor. Taste: Silk smells like silkworm, chemical fiber doesn't, not to mention cotton, and short fiber smells like mildew. (4) fire. The ignition point of silk is very low, and it will soon go out without an open flame. When burning, the smoke emitted is white, accompanied by the burning feather's burning smell of protein. The burnt ash is crisp and can be ground into powder by hand. Chemical fiber materials burn with black smoke, pungent smell, black ash and pinched hands, which is obviously different.