👉 The silk fluid, also known as sericin, is a natural protein secreted by silkworms during the spinning of their cocoons. It forms a sticky, gel-like substance that binds the fibroin fibers together, creating the silk's characteristic strength and flexibility. This fluid plays a crucial role in the cocoon-building process, providing structural integrity and protection to the emerging silk thread. After the cocoon is spun, sericin is often removed through degumming processes to enhance the silk's luster and softness for textile applications.