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单词 turmeric paper
释义

WordReference Random House Unabridged Dictionary of American English © 2024
turmeric pa′per, 
  1. Printingpaper treated with turmeric: used to indicate the presence of alkalis, which turn it brown, or of boric acid, which turns it reddish-brown.
  • 1800–10

Collins Concise English Dictionary © HarperCollins Publishers::
turmeric paper n
  1. paper impregnated with turmeric used as a test for alkalis, which turn it brown, and for boric acid, which turns it reddish brown
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