| 摘要 |
PROBLEM TO BE SOLVED: To provide "a color-changing toy or interior or the like" showing bright coloration, variously changing the color according to a time and a space and having "wonder" arousing an interest in the science. SOLUTION: This bright and beautiful "color-changing toy or interior or the like" is constituted of a container made of a transparent material visible the color in its inside, and pH indicator aqueous solution, acid solution and alkaline solution put in the container, produces a time change or spatial change in the color of the pH indicator aqueous solution by devising the pH indicator aqueous solution itself, devising its container, and devising a method of mixing the acid solution and the alkaline solution therewith and has the wonder arousing the interest in the science. COPYRIGHT: (C)2006,JPO&NCIPI
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