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.

Origin:
1800–10

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Urine acidified with hydrochloric acid and applied to turmeric paper pro- duces a brownish-red color if borate is present.
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