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HPTLC chromatogram of samples of stevia extract in daylight after spraying with anisaldehyde–sulfuric acid solution (track no. corresponds to 1,2: Bangalore; 3,4: Dehradun (a); 5,6: Dehradun (b); 7,8: Delhi; 9,10: Haridwar; 11,12: Indore; 13,14: Jammu (a); 15,16: Jammu (b); 17,18: Kangra; 19,20: Mohali; 21,22: Surat)
