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FINE PAPER WATERMARK DATE-CODE GRADE COTTON FIBER RAG SULPHITE ACID FREE FORMULATION SIZING SUBSTANCE WEIGHT OR BASIS WEIGHT A4 METRIC PAPER BOND PAPER PLEADING PAPER FINISH FINE PAPER: A class of paper grades ranging from the most elegant 100% cotton on the high side to #1 sulphite (the best processed wood pulp grade) on the low side.This class of paper, by industry standards, is identified by the presence of a watermark.The most common blend is made of 25% cotton and 75% wood pulp.
This is done by incorporating a special marker into the watermark.
The position of the mark is usually changed annually and legal records are kept documenting the date and its exact location.
back to top DATE-CODE: Many watermarks contain a date-code.
The purpose of the date-code is to protect the integrity of the document that is printed on the paper from fraud.
Of all wood pulp papers, only paper made of #1 sulphite is considered a “fine” paper and can be identified with a watermark.
Copy Paper Terminology
back to top ACID FREE FORMULATION: Paper which has no acid or residual acid-producing chemicals is called “acid free”.There are different grades of sulphite, depending upon how much processing has gone into making the pulp.Processing includes breaking the fiber down to very fine pieces and bleaching the natural color out of the wood to attain a high level of whiteness.Generally, given reasonable care, a customer can expect one year of usable life for every 1% of cotton contained in the sheet.Typically cotton fiber papers are made of either all cotton fiber (100% cotton) or a blend of cotton and wood pulp.A watermark may be centered or localized on each sheet, or more commonly it is a random mark.A random mark may be centered, but most often will appear in various positions from sheet to sheet.Sizing also contributes to the crisp, unique feel of cotton fiber papers.How the sizing is introduced to the paper will affect the finished characteristics of the sheet.The very best grade of sulphite is known as a #1 sulphite.Southworth uses only #1 sulphite in the manufacturer of its fine business paper.