Cookware typically uses grey iron, ductile iron, and cast steel (in the old days there was wrought iron from blacksmiths, but that time is pretty much gone for mass production of cookware). Host and coppersmith Sara Dahmen discusses the three main kinds of iron, how their graphite structures work, why you use them in different types of cookware or parts of cookware, and what to look for to fill out your batterie and why. To submit your own questions on cookware, visit www.housecopper.com/podcast