It is difficult to determine the genuineness or otherwise of powdered turmeric (Curcuma longa) when it is admixed with C. zedoaria or C. aromatica.
A simple and rapid thin-layer chromatographic technique is described that involves a three-step colour sequence for the detection of camphor and camphene, the active principles of these adulterants, which are absent in turmeric.
A. R. Sen, P. S. Gupta and N. G. Dastidar, Analyst, 1974, 99, 153 DOI: 10.1039/AN9749900153
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