The effect of color, as measured on the spectrometer, on the 4 basic tastes(sweet, salty, sour & bitter) perception of a series of colored and no-flavored solutions was quantified by 16 taste panel using magnitude estimation without modulus. The regression lines for each colored series were found to differ indicating that color had a significant effect on sweetness, sourness and bitterness. A sucrose level of 4.0%, a citric acid level of 0.05%, and a nicotinamide level of 0.08% maximized the effect of color on taste's perception and its acceptability. Although color tended to confuse the perception of saltiness, this effect was not significant except for yellow solutions.

Three sensory evaluations were conducted to assess the effect of food color on flavor identification. Elementary students and women university students served as subjects for three evaluations of hard candies, in order to assess color preference, to examine the effect of atypical color on flavor identification and to examine the acceptability of harmony between the color and the perceived flavor. Results showed that inappropriate coloring of the three flavored hard candies induced flavor responses that are normally associated with that color and decreased the acceptability. In addition, the acceptability of colorless candies is lower than that of colored candies. It is suggested from it that when there is no color on the product, even atypical color, it`s harder to identify the flavor and to get a high grade in its preference.

The purpose of this study was to provide basic data for developing effective forest healing programs for retirees by identifying their characteristics and preferences. A survey was conducted on demographic characteristics, overall perceptions of forest healing, and preferences for forest healing programs, targeting a total of 258 retirees visiting a natural recreation forest and a healing forest. The results of the survey suggested that the awareness of the forest treatment program and the hope of participating in it were both high, but the experience of participating in the program was low. Among the forest healing programs, the order of preference was "Breath in the forest", "Wind bathing and sunbathing", and "Feeling negative ions in the valley". Based on these results, it is expected that the forest healing program for retirees will be used as basic data for development of such programs in the future.