Zinc is naturally dull grey and is very hard to polish. Zinc has has an oxide that flakes off carrying some of the zinc so other things are coate...
If your like me and make scrap metal sculpture then it can sometimes be hard to identify what metal the scrap is made of. In this instructable I will show you how too identify some of the more common metals. NOTE: These are not all the metals there are, there are thousands and I couldn't possibly tell about all of them. Also if you bend tin it will make a light "snapping" sound.
Step 1: Ferrous or Nonferrous?
Ferrous means that the metal has iron content which in most cases makes it magnetic and nonferrous means it doesn't have iron in it. An example of a ferrous metal is mild steel, also known as low carbon steel. An example of a nonferrous metal is copper or aluminum. Its always a good idea to bring a magnet to the scrap yard.