Mrs. Stewart's Concentrated Liquid Bluing - Great for Laundry - 240ml Bottle (Pack of 2) - Whitens white clothes safely. Non-toxic. Bio-degradable. Why bluing. White fabric turns yellow or grey with age and repeated washings. Bluing restores the sparkling whiteness. Works on synthetics as well as natural fabrics without harming fibres like bleach can. So many other uses! Use Mrs. Stewart's Bluing in swimming pools, bird baths, for white hair and pets, for cleaning crystal and glass, and more!