When we engineered the s'more project we would put plastic covering. When put black paper on the bottom of the pizza box so that it could observe the heat and melt the s'mores. We put aluminum foil to reflect heat back into the box so that it could melt the chocolate and the marshmallow.What we found out about this is that are design had to much aluminum foil and instead of bring the heat in it reflected it back. So we decide to take off some aluminum foil and put black paper and the s'mores began to melt.