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METHOD OF DISPLAYING TIME LIMIT SUCH AS TIME LIMIT FOR BEST OF PERISHABLE FOODS, EFFECTIVE LIMIT OF MEDICINES BY CHANGE AND DENSITY OF COLOR DUE TO CHEMICAL REACTION OF CHEMICAL MATERIAL, DISTANCE OR AREA OF PROGRESSING REACTION
METHOD OF DISPLAYING TIME LIMIT SUCH AS TIME LIMIT FOR BEST OF PERISHABLE FOODS, EFFECTIVE LIMIT OF MEDICINES BY CHANGE AND DENSITY OF COLOR DUE TO CHEMICAL REACTION OF CHEMICAL MATERIAL, DISTANCE OR AREA OF PROGRESSING REACTION
PROBLEM TO BE SOLVED: To judge the time limit at a glance by displaying the time limit for best of perishable foods and the effective limit of medicines not only by small characters and symbols, but by change of color or change of density due to chemical change or the process of progressing reaction by distance or area. ;SOLUTION: Chemical material starting chemical reaction by light of ultraviolet rays or like or short-time heat treatment is applied to a label or a wrapping pack or the like, whereby the time limit for best or the effective time limit is informed by the distance or area where the color changes or the density changes in the process of progressing chemical change.;COPYRIGHT: (C)2001,JPO
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