Rekha Gharat, the woman, is now being treated at the KEM Hospital in Mumbai.
On July 26, her son Abhijit found a gift-wrapped bag left on his motorbike. A message with the bag said it was a gift for him and he should the "open the bottle".
Inside was a plastic bottle with some liquid. He took it home, and feeling that something was wrong, asked his mother not to open it. However, last night his mother tried to open the bottle and it exploded, police said.