Curcumin is a natural dye.Direct fuel use and also can be used as very indicative of pH, color range of 7.8 to 9.2,from yellow

Curcumin

Cas NO.: 458-37-7 Molecular formula:C21H20O6 Molecular Weight:368.38 Assay:≥90% Temperature : 183 ° C Appearance : orange yellow crystalline powder. Dissolved : do not dissolve in water, micro-soluble ether and benzene, can be dissolved in heating ethanol, acetic acid and Soluble in alkaline solution.

Curcumin