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

See Examples For:

turmeric paper

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

From The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. by Eyre, J. W. H. (John William Henry)

The machine was then worked for a few turns, and alkali immediately appeared at the point of the discharging train which rested on the turmeric paper.

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

Why must you be careful not to let the turmeric paper touch the sides of the test tube or the liquid?

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

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