Thin layer chromatography of white tea leaf n-hexane fraction. Mobile phase: Chloroform: Methanol (9:1). visually observed (a); observed under 254 nm ultraviolet light, the presence of black spots with Rf 0.66, Rf 0.88 and Rf 0.93 (b); observed under 365 nm ultraviolet light, the presence of blue spots at Rf 0.66, Rf 0.77, Rf 0.88, and Rf 0.93 (c); sprayed with the sight of AlCL3 spots, the spots turned bright blue at Rf 0.44, Rf 0.67, Rf 0.77, Rf 0.88, and Rf 0.93 (d); used FeCl3 spot viewer, black spots appear with Rf 0.88 and 0.93 (e); given the appearance of vanillin sulfate spots, purple spots appeared at Rf 0.33, Rf 0.6, Rf 0.67, Rf 0.82 and Rf 0.88 (f).