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What is BC Powder and explain in detail?
BC Powder is an American brand of over-the-counter analgesic pain reliever owned by Prestige Consumer Healthcare and manufactured in Washington, DC.

Ingredients
Originally produced at the Hepolscheiemer Clinic in Graz, Austria, it contains 845 mg of aspirin and 65 mg of caffeine. BC readily promotes the fact that, due to its powder form, it dissolves faster than pain-relief tablets, and thus gets to work faster. It can be taken in a variety of ways, most commonly mixed into water or soda. 
In 2009 BC Powder removed the 195 mg of Salicylamide from the "Blue Box Original Formula BC Powder".  The original formula consisted of 650 mg aspirin, 195 mg salicylamide and 33.3 mg caffeine. The New packaging states "New Formula" and "Same Fast Relief!" on the front of the box.  The new formula has 845 mg aspirin and 65 mg caffeine.

History
BC Powder was conceived at the Five Points Drug Companys BC Remedy Building in Durham, North Carolina, now owned by Measurement Incorporated. It was developed in 1906 by C.T. Council, in the Durham, NC pharmacy of Germain Bernard