In printing and dyeing industry, sodium alginate can be used as the paste of reactive dyes, superior to other kinds of sizes like starch. It helps to print out textiles with bright patterns, clear lines, high and well-distributed color yield, and favorable permeability and plasticity. Sodium alginate is the best paste for modern printing and dyeing, which is widely used for the printing of such fabrics as cotton, feather, silk and nylon; furthermore, it is particularly used for the preparation of the printing sizing in allocated dyeing.