Gallery Posted on by Bronze is a mixture of copper and tin, brass is copper and zinc. Other elements are added in small quantities to give certain properties to alloys. There are over 400 copper based alloys used today. Some are for casting, others are for extruding.Recyclers call it “red-brass”(bronze) or “yellow-brass”(brass). Aluminum card made with a “photopolymer” pattern, a black and white drawing made into a plastic sign with raised letters. Contact a local sign company for photopolymer in your area. Steering Wheel- 78 Camaro Bronze and aluminum Bronze and AluminumA small amount of bronze was poured into an open-faced mold. After cooling, the mold was filled with aluminum. Fine greensand captures all the detail in this plastic toy soldier.