turmeric paper

American  

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.

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turmeric paper British  

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

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Etymology

Origin of turmeric paper

First recorded in 1800–10

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.

From Project Gutenberg

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.

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg