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I found your statement about cocoa butter percentage to be a bit confusing. Yes you want a chocolate with a high cocoa butter content. However the percentage that is listed for most chocolates including the one you mention (These truffles used 68% dark chocolate candy bars that were a generic supermarket brand.) is not the cocoa butter percentage but the cocoa mass percentage. Most companies do not list the cocoa butter content but you can tell if its high based on its location in the ingredients. Ingredients are always listed in the order of most to least. Also be sure that a "cocoa butter" is listed and no vegetable oil is listed.