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Bluing, laundry blue, dolly blue or washing blue is a household product used to improve the appearance of textiles, especially white fabrics.
May 15, 2022 · Laundry blueing is made with a colloid of ferric ferrocyanide (blue iron salt aka "Prussian blue") in water. Other blue colourings have been ...
Jul 1, 2022 · As a side note, bluing is why almost all commercial liquids are blue. They contain a small amount of blue to help make whites look whiter.