In fireworks, copper is added to impart which color?

Options :
  1. Purple
  2. Red
  3. Yellow
  4. Green
Answer and Explanation :-

Answer: Option 4

Explanation:

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If the partridge didn't call at the wrong moment, Neither the hunter nor the falcon would know of it. It follows from this point also, That everyone's voice betrays him.
-Rahman Baba The Poetry of Rahman Baba: Poet of the Pakhtuns