If it is positive, then you may have a hepatitis B infection. This test may have to be repeated to confirm whether you have a chronic infection. 2. Hepatitis B surface Antibody (HBsAb or anti-HBs) - this tests for the surface antibody that your immune system makes to fight off the virus.
Rottenstone definition, a friable stone resulting from the decomposition of a siliceous limestone, used as a powder for polishing metals. See more. Dictionary.com
Rotten egg smell is from sulfur gas. It may be from just the hot water side which means chemicals in the water are reacting to the anode rod in the water heater. The anode rod prevent acidic water from attacking the tank and sacrifices itself to the acid water. In the process it may release sulfur gas.