from cooks illustrated dec'07:
1 cup cake flour = 7/8 cups all purpose flour plus 2 tbsp cornstarch
1 ounce unsweetened chocolate = 1&1/2 ounces bittersweet or semisweet chocolate minus 1 tbsp sugar from recipe
1 ounce bittersweet or semisweet chocolate = 1&2/3 ounces unsweetened chocolate plus 2 tsp sugar
1 cup light brown sugar = 1 cup granulated sugar plus 1 tbsp molasses
1 cup dark brown sugar = 1 cup granulated sugar plus 2 tbsp molasses
1 teaspoon baking powder = 1/4 tsp baking soda plus 1/2 tsp cream of tartar
1 cup whole milk = 5/8 cup skim milk pluls 3/8 cup half and half
1 cup cake flour = 7/8 cups all purpose flour plus 2 tbsp cornstarch
1 ounce unsweetened chocolate = 1&1/2 ounces bittersweet or semisweet chocolate minus 1 tbsp sugar from recipe
1 ounce bittersweet or semisweet chocolate = 1&2/3 ounces unsweetened chocolate plus 2 tsp sugar
1 cup light brown sugar = 1 cup granulated sugar plus 1 tbsp molasses
1 cup dark brown sugar = 1 cup granulated sugar plus 2 tbsp molasses
1 teaspoon baking powder = 1/4 tsp baking soda plus 1/2 tsp cream of tartar
1 cup whole milk = 5/8 cup skim milk pluls 3/8 cup half and half