DIY: How to Whiten Your Sheets with Laundry Bluing ...
Apr 03, 2017·Laundry bluing is an age-old washing practice whereby whites are rinsed with a bit of diluted, nontoxic, biodegradable blue powder. The best-known bluing product is Mrs. Stewart’s Bluing Liquid, made of a fine blue iron powder suspended in water mixed with small amounts of pH balancer and a biocide to prevent the buildup of algae and bacteria.