In Thailand is coming to completed-aged. This paper aimed to investigate the color preference of rice for Thai elderly people. First, we stained color to rice by Anchan (Blue), Curmin (yellow), Bi-tery (green) Ka-jeab (red) and normal white rice. We prepared the questionnaire on website. We asked thirty-three elderly people to participate in the experiment. The result showed high score of preference of green, blue, yellow, red rice respectively. For white rice showed high preference score almost same as green rice. Subjects commented that they feel natural, healthy with green color. White rice was looked common but it could make good contrast with food quite well.

　The checkable indicator ink (C_ii) was developed on the basis of semiconductor (SC) photocatalyst reaction and the redox dye (D) which could be printed as security ink and checked by exposing to UVA-light for counterfeit products. The C_ii comprised of SC (titanium dioxide, TiO₂), D (anthraquinone-2-sulfonate, AQS) and electron donor (glycerol), was dispersed in a polymer medium. Upon UVA exposure, the C_ii label abruptly changed from colorless to yellow. At this state, the yellow-green luminescence of this Cii label was distinctly revealed when it was witnessed under dark condition. However, the C_ii could be recovered to its original color when it was placed under room atmosphere for ~1.5-6.5 hrs.

　This study aims to experiment appropriate ratio of pigment from the nature to develop as Oxygen indicator. The trial brought the natural pigment of two kinds of vegetation, Red Cabbage and Turmeric. The intensity changes of the SC were in the ratio to weight of 30, 50 and 70 and SED with the ratio of 750, 1000 and 1500 of MC of 10-percent intensity of the weight as the binder. It was found that Red Cabbage film in the ratio to weight of SC to SED equal to 50: 1500, 70: 1500 rapidly changed and acquired the least time for 960 seconds upward after UV radiation. The Turmeric film took the mildest color of change with its original color.

　Linear color additivity rules were foundation of color science. There were three linear color additivity rules. The first rule is A + B = B + A. The second rule is if A = B then kA = kB. The third rule is if A = B and C = D then A + C = B + D. All those rules were valid in spatial domain of human color vision while my new visual illusions showed that the first rule, A + B = B + A, was broken in temporal domain while others remained.

　This research aimed to demonstrate the simultaneous color contrast under three devices such as in the two-room, on the display and object. Four color papers of surrounding; red, yellow, green and blue were prepared. Gray patch pasted in the center of color paper. Subject task was to judge the color appearance of the gray patch by elementary color naming method. The result shows high amount of chromaticness of the gray patch in the two-room and display respectively. But the result of object viewing condition showed low amount of chromaticness. In the case of display the amount of chromaticness and hue judgement is similarly because of subject could perceive the color of surrounding as illumination but not color of an object.

　This is an experiment on the simultaneous color contrast done by two techniques. In both cases the quantal catch was made equal at the central retina of 13°×10°. In one technique a small gray patch was placed on a colored paper, while in the other technique the same area was stimulated by the same color as for the paper technique but by illumination in a room. The color appearance of the central patch was measured by the elementary color naming. With the illumination very vivid color was perceived at the patch, while it was almost no color in the paper condition. The results showed the chromatic adaptation to take place to the illumination and not to the color of object.

　The simultaneous color contrast SMCC was investigated by the afterimage. The color appearance was measured, by the elementary color naming, for the central patch in the afterimage, for the surrounding, and for the afterimage of the surrounding. The color of the after image of the central patch was same as the color of the surrounding. The relation of the hue of the afterimage of the central patch to the hue of the surrounding afterimage suggested that the SMCC in the afterimage is yielded by the chromatic adaptation to the illumination of the surrounding afterimage.

　Vivid colored LED light have a huge impact on human color perception. To investigate the color appearance of object color under vivid colored LED lights twenty-four color chips were assessed by five subjects using the elementary color naming method under ten lights with the increasing of vivid red; D65, R1, R2,… , and R9 which R9 is pure red LED. Data of eleven color chips covering hue were selected to plot on the polar diagram for analysis the amount of chromaticness and the hue angle changes. The results showed the changes of hue angle increased and decreased of chromaticness for more vivid color light, implying the deterioration of the color constancy with more vivid red color of LED lighting.

　Two experiments, MPOD measurement and brightness matching, were conducted. Individual MPOD was calculated from the results of central vision and peripheral vision (eccentricity of 6 degree). Twenty-two colors selected on the color gamut of a display were used for brightness matching. Ten subjects in their twenties participated. The results showed a negative correlation between B/L and MPOD. This means the B/L of color stimulus decreases as the MPOD increases. Also showed the same trend as the stimulus that contains large amount of short wavelength light to that does not contain short wavelength light. This suggests that there may be the higher mechanism that the compensation for the short wavelength region extends to other regions.