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borax bowl,Stainless steel alum bowl,alum cup,gold and silver jewelry cleaning tools and equipment Add water to the alum and boil the welded product in the cup. The surface of the welded product is blackened with borax, which plays a cleaning role. Description: Shape: round Style: jewelry processing Material: Stainless steel Function: high temperature resistance Stainless Steel Alum Cups Borax Cooking Bowl Jewelry Processing Equipment Gold Striking Tools
