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turmeric paper

noun

  1. paper treated with turmeric: used to indicate the presence of alkalis, which turn it brown, or of boric acid, which turns it reddish-brown.


turmeric paper

noun

  1. chem paper impregnated with turmeric used as a test for alkalis, which turn it brown, and for boric acid, which turns it reddish brown
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of turmeric paper1

First recorded in 1800–10
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Example Sentences

Its action upon turmeric is characteristic; a turmeric paper moistened with a solution of boric acid turns brown, the colour becoming much darker as the paper dries; while the addition of sodium or potassium hydroxide turns it almost black.

Before the blow-pipe, this species of calculus expands into a kind of white efflorescence, which, when moistened and brought into contact with turmeric paper, stains it red.

Dissolve the residue in a small quantity of hot water and moisten a piece of turmeric paper with the solution.

In India they inhale the fumes of burning turmeric paper for coryza, and with good effect according to the testimony of Dr. Waring.

Turmeric paper is prepared by impregnating unsized paper with this tincture, and then drying.

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