Step 11: Recovering Your Gold.
Recovering your gold in solution is one of the Coolest steps.
Whats needed, a plastic spoon, and the sodium Bisulfate or Stumpout.
Simply add very small amounts of stumpout, Your Mixture should start to look like the pictures I have provided. This is caused by the SO2 Gas which acts to chemically displace the gold in solution.
When the reaction has finished you will have driven out a majority of the chlorine, and replaced it with Sulfur. Any gold which was trapped in the solution has now be come a brown precipitate at the bottom of your beaker.
Retest with Stannous chloride, if your reaction still turns purple you need to add more stumpout.
It will take appox 10 hours for the gold to competely settle, the solution should be clear at this point.