Salt Water Bath Etching

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Across
  1. 2. What do you see when the circuit is connected?
  2. 4. What type of acid is used?
  3. 6. What stops the whole plate being etched?
Down
  1. 1. Which terminal on the battery does the tin plate connect to?
  2. 3. What is the source of energy?
  3. 4. How many minutes does it take to etch the plate?
  4. 5. What type of metal plate is being etched?