Muv, American definition of Parchment Paper:
Parchment paperModern parchment paper is made by running sheets of paper pulp through a bath of sulfuric acid (a method similar to how tracing paper is made) or sometimes zinc chloride. This process partially dissolves or gelatinizes the paper, a process which is reversed by washing the chemicals off followed by drying. This treatment forms a sulfurized cross-linked material with high density, stability, and heat resistance, and low surface energy – thereby imparting good non-stick or release properties. The treated paper has an appearance similar to that of traditional parchment.
Definition of "Genuine Parchment"
Specialty Expressions: genuine parchment
Expressions Domain Definition Genuine parchment Meteorology & Standards Paper which as a result of treatment with sulphuric acid has a dense, hard structure and is thus resistant to the penetration of organic substances such as fat and oils and is resistant to decomposition even in boiling water. Source: European Union. (references)