Useful but bad smells.
First of all, it works. Remember follow the instructions and put it into the liquid no more than 10 sec. Then bring out the jewelry on the free fabric and wipe it. You would see some black things on the fabric. By the way the smell is really suck. It smells like hydrogen sulfide. I recommend use this product at ventilated place. I thought it should go with another small plastic cup.
Rating: 4 stars