6 CUP COPPER FLAT BOTTOM MERINGUE WHIPPING MIXING BOWL Vintage.  This bowl is perfect for beating egg whites to stiff points for pie topping or meringue cookies.  The copper reacts with the protein in egg whites to create stiff peaks eliminating the need to add cream of tartar.  I've had this bowl for many years, time to let go.  Also looks pretty hanging on the wall.