Why do we add Blue Tint to white Clothes while washing
White fabrics acquire a slight color cast after use (mainly grey or yellow). Since blue and yellow are complementary colors in the subtractive color model of color perception, adding a trace of blue color to the slightly off-white color of these fabrics makes them appear whiter. Laundry detergents may also use fluorescing agents to similar effect. Many white fabrics are blued during manufacturing. Bluing is not permanent and rinses out over time leaving dingy or yellowed whites. A commercial bluing product allows the consumer to add the bluing back into the fabric to restore whiteness.On the same principle, bluing is sometimes used by white-super people in a blue rinse.
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