配方类型：	METALS
配方说明：	Removing Coffee Stains from Stainless Steel
配方组成：	Water/9 gal Temperature: 200-210 F Time: 5-15 min 2. Water rinse 3. Solution Potassium Permanganate/16 oz/gal Nitric Acid/1 gal Caustic Soda/32 oz/gal Hydrofluoric Acid/1 qt Hydrochloric Acid/1 pt
配制方法：	Temperature: 130-140 F 4. Water rinse. If the surface condition needs further improvement use bright dipping or electropolishing methods.

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