Rich buys broken solar panels for the silver inside, but learns it's nearly impossible to get the silver out by himself. He pays a professional to do the job -- a big gamble. Dave is playing it safe, making no initial investment in the dental X-ray fixer solution he's gathering up from local dentists. Used to develop X-rays, fixer removes the silver from the film and contains silver residue. Meanwhile, Diego's made an investment of $450 to buy a casket for the gold letters engraved on it.
