Pewter known as "trifling metal" or "trifle", was used for holloware and is made up of fine metal with approximately 4% lead. The last type of pewter, known as "lay" or "ley" metal, was used for items that were not in contact with food or drink. It consisted of tin with 15% lead. These three alloys were used with little variation until the 20th century. Older pewters with higher lead content are heavier, tarnish faster, and oxidation gives them a darker silver-gray color. Pewters containing lead are no longer used in items that will come in contact with the human body
What Is History? that events could not have happened differently unless there was a different cause. He called “these so called accounts in history represent a sequence of cause and effect interrupting and so to speak clashing with the Sequence of which the historian is primarily concerned to investigate.” He feels that the main job of a historian is to investigate the reasons/causes as to why events occurred and not to create the events or justify them. He was not a fan of "what if" history and he found it pointless because it did not happen. Carr saw accidents in history as impossible