My 'rubber' egg

For my homework, I chose the 'rubber' egg, to see if the vinegar would make the hard egg soft in vinegar. I covered the egg in vinegar, L&P and water. The water did not work, L&P sort of soft but vinegar was really soft. I tried the egg in the liquid for three days. Maybe you can try it for more or less days or months or years? Try using boiling hot water instead of freezing cold water?