|This shows several ways to use a blowpipe for mineral analysis.|
Step 1. First grind a small sample of gold ore to a powder in an agate mortar.
Step 2. Mix this powder with an equal amount of either borax or sodium carbonate.
Step 3. Place this powder into a recess in a charcoal block.
Step 4. Blow a hot flame onto the sample with a blowpipe.
Step 5. After the sample has melted allow it to cool. If gold is present it will collect as a small button at the base of the melted sample.
Step 6. Dissolve the sample in water saving the part that doesn’t dissolve.
Step 7. Put the residue into a small amount of dilute nitric acid, if it is yellow in color and doesn’t dissolve it is gold.
Do not get any acids on you!
Cyanide is deadly poisonous, don't eat the stuff!