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acid-free

adjective

: not containing acid : having a neutral or alkaline pH
acid-free paper
Every evening, trained volunteers will place any personal items or memorabilia left at the replica wall in archival folders or acid-free boxes. Brian Burnes, Kansas City Star, 22 Sept. 2010

Word History

First Known Use

1885, in the meaning defined above

Time Traveler
The first known use of acid-free was in 1885

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