A three-phase study was conducted to evaluate calyx of Roselle plant sobo (Hibiscus sabdariffa) as a substitute for acid orange in colouring kilishi. In phase one , thirty kilishi producers were selected using convenience sampling and interviewed to obtain the concentration of acid orange used for colouring. In the second phase a spectrophotometer experiement was used to test various concentrations of sobo that will match the colour absorbance of the acid orange concentrtation obtained from phase one of the study. In phase three, two kilishi samples, one coloured with acid orange at the concentration obtained in phase one, the second coloured with sobo at the  concentration that matched  the concentration of the acid orange.Two sensory tests were used to compare the samples. The first test was to determine whether the samples were the same or different. The second test compared the samples for colour preference. The modal concentration of acid orange used by kilishi processors was 1.12 mg/ml and the sobo concentration that matched its absorbance (1.999nm) was 56mg/ml. There were significant difference in taste in taste and colour preference of the products. It is revealed that  kilishi coloured with sobo is not an acceptable substitute for acid orange.

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