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

Solutions of boric acid give with "turmeric paper," which has been dipped into it and dried, a characteristic red tint.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius

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

Test the gas given off with moistened turmeric paper.

From Human Foods and Their Nutritive Value by Snyder, Harry

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)

This is dissolved in water, rendered faintly acid with dilute hydrochloric acid, and a strip of turmeric paper immersed for a few minutes in the liquid.

From The Handbook of Soap Manufacture by Simmons, W. H.