turmeric paper

noun

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

chem paper impregnated with turmeric used as a test for alkalis, which turn it brown, and for boric acid, which turns it reddish brown

First recorded in 1800–10

Place a strip of turmeric paper in this solution for a few minutes, then remove and dry it.

If boric acid either free or combined is present, the turmeric paper will be turned to a cherry-red color.

Turmeric paper may be prepared by dipping pieces of smooth, thin filter paper in a solution of powdered turmeric in alcohol.

Soak a piece of turmeric paper in the extract, and if boric acid is present the paper will be colored rose-red when it is dry.

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

April 19, 2024tortuous

[tawr-choo-uhs ]

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