section_path: Mature Harappan/Metallurgy
section_name: Metallurgy
paragraph_text: Metallurgy
  
  Harappans evolved some new techniques in metallurgy and produced copper, bronze, lead, and tin.
  
  A touchstone bearing gold streaks was found in Banawali, which was probably used for testing the purity of gold (such a technique is still used in some parts of India).