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The heat discoloration material will be printed on the band-aid. When the child needs to apply the band-aid to stop bleeding after the injection of the vaccine, Because of the body temperature of the palm, the color of the material will change and different cartoon patterns can appear, reducing children's fear of vaccine injection. To get the best hemostasis , the pressing should last for 5 minutes when color turns to the brightest.When the color fades, you can remove the band-aid and discard it.
School of Software Technology
Zhejiang Hangzhou, China
Zhejiang Sci-Tech University