Places where you can purchase materials called for in this lesson

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- May 24, 2019 at 8:27 pm #7568
  
  Bernard Nebel
  Keymaster
  
  Prism:
  
  White poster paper: any office supply store
  
  Compact mirrors (at least four):
  
  Plastic cellophane of different colors (red, yellow, green, and blue):
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