Copper Mixing BowlsCopper Mixing Bowls The Gold Standard for Whipping Egg Whites There is nothing finer for whipping eggs than pure copper. Inspired by the legendary French omelette house of Madame Poulard at Mont Saint Michel, these Sertodo Copper Mixing Bowls carry forward a tradition trusted by chefs for over a century. Serious bakers know: copper changes the outcome. Why Use Copper? When whisking egg whites, copper interacts naturally with proteins to help create: