Casting --  One of the predominant alloys used for making organ pipes is composed of a mixture of tin and lead. These two metals are melted together and cast in flat sheets on a specially designed table. Because the two metals have different melting points, the resulting alloy takes on a spotted appearance as it cools, commonly known as "spotted metal." The blocks, or bases, of reed pipes are also cast in this room. Spotted metal is cast several times a year. The sheets are subsequently aged for at least six months before they are processed in our one-of-a-kind metal planer, designed by Reuter engineers and built in our machine shop, to achieve uniform thickness.