To extract natural dye the best method for dye extraction is the solvent extraction. Usually volatile solvents such as pet ether or n-hexane or ethyl acetate or chloroform are used for extraction . The the colored material of plant such as flowers are soaked in a closed container . Kept for 2-3days & the solvent removed by rotary evaporation to get natural dye.

Hello, I agree with Dr. M.B. Deshmukh, and addition, After extraction the natural dye must identification by FT-IR, UV -scan...etc to ensure from the structure formula.

hello I agree with Dr Desmukh , but you can also use sonication processes along with the solvent as suggested by above .