I had an old wine kit that had been stored a few years in the basement. It has always been 65 deg. F. down there. The bag with the juice is sealed and looks ok (no bloating etc.) I bought some new yeast and though I would try making it. When I took a hydometer reading the hyrdometer sunk to the bottom of the tube.......Tested hydrometer in water and it floated fine. What does the sinking mean? Does the wine juice bad?