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Title: Chemists do now understand why egg whites beat best in copper
Review: Cookwise by Shirley O. Corriher explains the chemistry involved in the use of a copper bowl for beating egg whites. Corriher is a better read than McGee. This copper bowl is probably as good as any you are likely to find for under fifty dollars. If you don't want to mess with removing the varnish, find a band instrument repair shop who can do it for you.
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