The rhizome of Curcuma longa.

Turmeric Tincture, B.P.; Solution of Turmeric, U.S.P. A solution prepared by macerating 1 part bruised turmeric in 6 parts rectified spirit, B.P., or diluted alcohol, U.S.P., in a closed vessel for 7 days, and filtering.

Turmeric Paper, B. and U.S.P. -Unsized white paper coloured by steeping in tincture of turmeric and drying by exposure to the air without heat. Action and Uses

Turmeric acts similarly to ginger. Chiefly used as a condiment. Turmeric paper is used as a test for alkalis, which turn it brown.