Whiten white clothes safely! Non-toxic. Bio-degradable. Standard of excellence since 1883. Why bluing? White fabric turns yellow or gray with age and repeated washings. Bluing restores the sparkling whiteness. Works on washable synthetics as well as natural fabrics without harming fibers like bleach can. So many other uses! Including making a salt crystal garden. Please visit our website for more information. www.mrsstewart.com.