Sir Walter Raleigh, a Janus agent, stole this clue and took it to the New World. However, the Lucians tracked the clue, demolished the colony on Roanoke, and took the clue back to the Tower of London. They arrested Raleigh and held him in the Tower of London so he would be stuck there forever, knowing the clue was so close but he still wasn't able to get it.
Salt is a white object made up of sodium chloride. It is commonly used for flavoring foods. Too much ingestion of salt can raise one's blood pressure.