A single pigment is not enough to meet the wide range of application requirements, so the blending of pigments is one of the development directions. In this study, natural pigments gardenia yellow and curcumin were used as materials, and the stability of the pigments was measured by the change of absorbance under the characteristic absorption wavelength of the blend system. Besides, infrared spectroscopy was utilized to detect the molecular interaction in the blend system, and UV-vis spectrophotometer was used to detect the absorbance under the conditions of different light, temperature, pH value, reducing agent, oxidant and metal ion. The results showed that gardenia yellow and curcumin might form complex mainly through hydrogen bond.Its stability was much better than that of a single pigment, and the wavelength of characteristic absorption peak was 430 nm. The blend system was greatly affected by sunlight and monochromatic light (blue light). It was unstable at temperatures above 60 ℃ or strong acid-base conditions. The blend system was stable to oxidant and reducing agent environment, but it was sensitive to Fe3+ environment. Appropriately increasing the proportion of curcumin was beneficial to enhance the stability of the system. This study revealed that the stability of the blend pigments could be improved compared with the single pigment, which will provide a theoretical reference for the research and application of gardenia yellow, curcumin and the blend pigments.
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