Turmeric paper
Revision as of 06:18, 24 July 2013 by (username removed)
Description
An acid indicating paper. Turmeric paper is an absorbent filter paper dye with the extract from turmeric roots. It contains curcumin which is an acid-base indicator. Curcumin is yellow with acids (below pH 7.4) and a reddish brown with alkalis (above pH 8.6). Curcumin also turns brown in the presence of boron compounds such as boric acid. Turmeric is commonly used as a yellow dye in paper made in the Punjab.