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《Journal of Anhui Agricultural University》 2006-02
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Color indicator of green tea and color card of sensory test

WANG Tong-he,ZHOU Jie,DU Li-gen(Key Laboratory of Tea Biochemistry & Biotechnology,Ministry of Agriculture,Anhui Agricultural University,Heifei 230036)  
The picture of green tea LIUANKUAPAN was taken with digital camera and treated with Photoshop software.Through the analysis of multiple image points,three mean value of color parameters were as follows:L is 54,a is -11,b is 22.The color determined by three color parameters above has good consensus with sensory test.Color parameters of eight kinds of green tea(drying tea color,liquor color and infused color) were got by the same way described above and sensory test was processed at the same time.Through calculation with different forms,,b/a,Cab and Sab were got respectively.The results showed that these parameters were significantly correlated to the organic quality of tea.The a value and Sab value of dry tea color were correlated to the organic quality of tea for(-0.9598) and 0.8510 respectively.The Sab value of liquor color were correlated to the organic quality of tea for 0.9378.The Cab value of infused color were correlated to the organic quality of tea for 0.9226.These results proved that the color of green tea stand for the quality well.According to the minimum value(31,-40,20) and the maximum value(95,0,68) of eight green tea′s luster parameter L,a,b,color card Lab initial value(30,(-60,)20) and termination value(90,0,80) were defined,there are 216 000 kinds of color totally.The extent defined above were separated by 5,10,20 interval respectively,three kinds of color card were got.They are the professional version(2 197 kinds color),the standard version(343 kinds color) and the simplification version(64 kinds color) respectively.No matter what version is feasible for the sensory test teaching color card.
【Fund】: 安徽农业大学重点课程建设项目
【CateGory Index】: TS272
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