acid free


acid free
   A characteristic of inert materials; especially said of papers with a 7 pH, or very close to 7 pH. Below 6.5 pH or above 8.5 pH is not considered acid-free. Acid free materials are more permanent, less likely to experience acid migration — to discolor, or to deteriorate materials they are placed with over time. Works on paper, and the mats, mounts, etc. with which they are framed, are best acid free. This term is sometimes used incorrectly as a synonym for "alkaline" or "buffered." Such materials may be produced from virtually any cellulose fiber source (cotton and wood, among others), if measures are taken during manufacture to eliminate active acid from the pulp. However free of acid a paper or board may be immediately after its manufacture, over time the presence of residual chlorine from bleaching, aluminum sulfate from sizing, or pollutants in the atmosphere may lead to the formation of acid unless the paper or board has been buffered with an alkaline substance. The presence of alpha cellulose in paper or board is an indication of its stability or longevity. Non-cellulosic components of wood are believed to contribute to the degradation of paper and board. Also see adhesives, archival image, art conservation, buffer, glassine, polypropylene, and storage.

Glossary of Art Terms. 2014.

Look at other dictionaries:

  • acid-free — adj. Acid free is used with these nouns: ↑paper …   Collocations dictionary

  • acid-free — adjective a) Alkaline or neutral; not acidic. b) Without using acid …   Wiktionary

  • Acid-free paper — is paper that has a neutral or basic pH (7 or slightly greater). It addresses the problem of preserving documents for long periods. Overview Paper made from wood based pulp that has not had its lignin removed goes yellow and deteriorates over… …   Wikipedia

  • acid-free paper — /æsəd fri ˈpeɪpə/ (say asuhd free paypuh) noun paper which has had the acid removed from the pulp so that it has a neutral pH, making it less subject to deterioration than normal papers; archival paper. Also, permanent paper …   Australian English dictionary

  • Acid-free paper — Бескислотная бумага; антикоррозийная бумага; Бескислотная бумага; Антикоррозионная бумага …   Краткий толковый словарь по полиграфии

  • acid —    Any of a large class of substances capable of reacting with and dissolving certain metals into salts, and of reacting with bases or alkalis to form salts. Acids can weaken cellulose in papers, cardboards, and textiles, eventually making them… …   Glossary of Art Terms

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  • Free fatty acid receptor 2 — Free fatty acid receptor 2, also known as FFAR2, is a human gene.cite web | title = Entrez Gene: FFAR2 free fatty acid receptor 2| url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene Cmd=ShowDetailView TermToSearch=2867| accessdate = ] PBB… …   Wikipedia

  • Acid-jazz — Pour les articles homonymes, voir Acide (homonymie) …   Wikipédia en Français


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