Deterioration - Rekka (English spelling)

Japanese: 劣化 - れっか(英語表記)deterioration
Deterioration - Rekka (English spelling)
Damage to materials caused by physical, chemical, or biological factors. Deterioration due to physical factors refers to materials being destroyed by physical forces applied due to copying, improper shelving, etc. Chemical factors include heat, light, acids, and alkalis. These cause chemical reactions in the substances that make up the materials, leading to discoloration and deterioration of paper materials and the acetic acid smell of microfilm. Biological factors include mold and insects that appear on materials. Deterioration of materials can be caused by any one of these factors, or a combination of factors. [See also] Materials preservation

Source: Dictionary of Library and Information Science, 4th Edition Dictionary of Library and Information Science, 5th Edition About Information

Japanese:
資料が,物理的,化学的,生物的要因から損傷を受けること.物理的要因による劣化とは,複写や不適切な排架などのために加わる物理的な力によって,資料が壊れることをいう.化学的要因としては,熱や光,酸やアルカリがあげられる.これらによって,資料を構成している物質が化学反応を起こし,紙資料の変色や退化,マイクロフィルムの酢酸臭などを引き起こす.また生物的要因としては,資料に発生するかびや虫などがある.資料の劣化は,これらが単一の要因,または複合的な要因となって引き起こされる.[参照項目] 資料保存

出典 図書館情報学用語辞典 第4版図書館情報学用語辞典 第5版について 情報

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