What is the stripping effect of fixing agents?

Dyeing factories often improve the fastness of fabrics by using dip and roll fixing agents. In actual production, there is often a phenomenon where the color of the fabric becomes lighter after the dip and roll fixing agent is used, which is the stripping phenomenon of the fixing agent.
Direct dyes and cellulose fibers are combined by van der Waals forces and hydrogen bonding forces, which have low water washing fastness. Direct dyes are anionic, while fixing agents are cationic. The two combine in solution to form large molecular particle lakes.
Whether it is the "coloring" of fibers during the dyeing process or the "decolorization" of fibers during the soap washing process, the dyes in the solution always have a tendency to aggregate towards the fibers, that is, coloring; On the contrary, dyes that have been attached to fibers always have a tendency to diffuse into the solution, that is, to peel the color. But during the entire reaction process, these two trends will reach a dynamic equilibrium, and the final color dyed on the fabric is the result of achieving a balance between "coloring" and "decolorization".