No - but dark thin-walled pots with lids work best. Dark pots change the light from the sun into heat energy. Using lids is very important because they hold steam inside the pot. If a lid is not used the steam will dissipate much of the heat. Shiny, bright, or light colored aluminum pots and pans cause light to be reflected out thereby reducing the oven's temperature. Glass casserole dishes with lids also work well. For baking cakes, breads, cookies, and pies, dark cookie sheets and baking tins work best.

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