So I have a new bronze diver and wanted to give the patina a kick. Hardboiled two eggs, mashed them up, and put them in a ziplock with the watch for 25min or so. The color changed a bit, not too drastic, and I was happy. By afternoon almost all of the patina had worn off. Tried again tonight using the same technique but with a tupperware container and the hardboiled eggs hot. Almost nothing happened. Where am I going wrong, anyone have a suggestion?