What is train of many metals?

The train of many metals is a science experiment that uses a simple chemical reaction to deposit different types of metals onto a strip of zinc. The experiment involves dipping a strip of zinc in a solution of copper sulfate. The copper ions in the solution react with the zinc strip, depositing a thin layer of copper onto the surface. When the strip is removed from the copper sulfate solution and rinsed, it can then be dipped into a solution of another metal salt, such as silver nitrate or nickel sulfate. The metal ions in the new solution react with the copper layer on the zinc strip, creating a new layer of metal on top. This process can be repeated with multiple metal salts, resulting in a strip of zinc with a multi-colored, layered pattern of metals. The train of many metals is a fun and educational experiment for kids and adults to explore the principles of chemistry.