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

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 North American Medical and Surgical Journal, Vol. 2, No. 3, July, 1826 by Bache, Franklin

The machine was then worked, the positive electricity passing into the turmeric paper at the point p, and out at the extremity n.

From Experimental Researches in Electricity, Volume 1 by Faraday, Michael

What is the appearance of the turmeric paper after being dipped in the meat extract and dried?

From Human Foods and Their Nutritive Value by Snyder, Harry

Dip a piece of turmeric paper in the meat extract and dry.

From Human Foods and Their Nutritive Value by Snyder, Harry

The turning of the machine caused the corners of the piece of turmeric paper opposite to the point to turn brown, thus declaring the presence of alkali.

From Faraday as a Discoverer by Tyndall, John