Things You'll Need
Instructions
Place the crucible on the Bunsen burner using tongs. Turn on the burner, keeping the heat low.
Increase the heat until the crucible reaches an approximate temperature of 500 degrees, as indicated by the laser thermometer. Hold at this temperature for approximately 20 minutes.
Increase the heat again, this time allowing the crucible to heat until it becomes red-hot. Once it reaches red heat, turn off the heat and allow the crucible to cool gradually.
Remove the crucible with your tongs, and place it on top of the balance, both of which should be on top of the wire gauze to protect your working surface.