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
Canonical link element document. 11. Site Host https://sitehostnp.com/canonicalization/canonical-link-element/. What s "rel=canonical" link element and how it should be used for search engines. Published on 14 June 2018. Canonical link element A canonical link element is an HTML element that helps webmasters prevent duplicate content issues in search engine optimization by specifying the "canonical" or "preferred" version of a web page. It is described in RFC 6596, which went live in April 2012. A major problem for search engines is to determine the original source for documents that are available on multiple URLs. Content duplication can happen in a many ways, including: Duplicate content