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Acid-free paper is paper that, if infused in water, yields a neutral or basic pH (7 or slightly greater). It can be made from any cellulose fiber as long as the active acid pulp is eliminated during processing. It is also lignin- and sulfur-free. [1] Acid-free paper addresses the problem of preserving documents and preserving artwork for long ...
The U.S. Permanent Paper Law, or P.L. 101-423, is a joint resolution calling for the use of acid-free paper for federal records, books, and "publications of enduring value." [ 1 ] It was signed into law by President George H.W. Bush in October 1990.
Acidic paper is paper which was manufactured using acidic substances. [1] Widely used since the mid-nineteenth century, its pages become yellow within years, extremely brittle over decades, and eventually unreadable in the library and archive collections intended to preserve them. [ 2 ]
Although acid-free paper has become more common, a large body of acidic paper still exists in books made after the 1850s; this is because of its cheaper and simpler production methods. Acidic paper, especially when exposed to light, air pollution, or high relative humidity, yellows and becomes brittle over time. [1]
Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from sulfite ...
Greaseproof paper is paper that is impermeable to oil or grease, and is normally used in cooking or food packaging. It is usually produced by refining the paper stock [ further explanation needed ] and thus creating a sheet with very low porosity .
These plants all contain salicylic acid, which does indeed have these medicinal effects on humans. ... Toilet paper sold on a cardboard roll appeared in the 1890s, and in 1928, Wisconsin's Hoberg ...
The preferred method for storing manuscripts, archival records, and other paper documents is to place them in acid-free paper folders which are then placed in acid-free of low-lignin boxes for further protection. [21] Similarly, books that are fragile, valuable, oddly shaped, or in need of protection can be stored in archival boxes and enclosures.
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