Figure 3: Extending separation capacity of HPTLC image and digital scanning profile of Forthysiae fructus with two plates associated seamlessly. (L) immature fruits (‘Qing-Qiao’) (R) mature fruits (‘Lao-Qiao’) A: visible color image; higher polarity fraction developed with solvent system (1); B: lower-polarity fraction, squeezed on the front of the image (A); C: fluorescence image of B (lower polarity fraction) developed with solvent system (2)