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Q. Brown stains in vessels and clothes indicate the presence of high quantities of ____ in water:
Answer: Manganese
Notes: Brown stains in vessels and clothes generally indicate the presence of high quantities of iron. It causes reddish-brown staining of laundry, porcelain, dishes, utensils and even glassware. Manganese acts in a similar way but causes a brownish-black stain. Soaps and detergents do not remove these stains.

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