Circuit board fingers, found inside computers, are covered in gold plating and look like fingers that insert into connectors within the computer. People collect or purchase old, obsolete computers for the purpose of recovering gold from the computer's electronics. In order to recover enough gold to make a profit, you need to collect a hundreds of old computers---or at least purchase hundreds of circuit boards. You can recover the gold plating from the circuit board fingers in several different ways: some time consuming, some expensive and some just plain dangerous and toxic. But probably one of the quickest, easiest and safer ways to remove the gold involves soaking the circuit board fingers in a solution of circuit board stripping powder.
Put on protective eyeglasses and long dish gloves.
Dump one whole container of circuit board stripping powder into one of the ceramic bowls. (Look for this powder online at gold mining supply stores.)
Pour 1 gallon of water into the bowl, and mix the contents with a wooden spoon until the powder dissolves.
Add the circuit board fingers to the bowl, and let it soak for eight hours.
Put on your gloves again; remove the circuit board fingers from the mixture and set aside.
Put a plastic and metal coffee filter in the bottom of the second ceramic bowl, then pour the solution through the coffee filter. Carefully lift the filter up as the bowl fills with liquid, and continue pouring the liquid through the filter. The filter will trap the gold, and the liquid will drain through.
Another way to remove gold from circuit board fingers involves scraping it off manually using a paint scraper---an extremely slow process.