Interesting designs: these inspirational pencils for testing adopt the technology of the color changing; It needs to be rubbed by hand will change color obvious, because of hands temperature and outside large temperature difference, they will be white and light; Warm Notice: the color changing will be more obvious when the temperature is below 15 degrees (the lower the temperature, the more obvious the discoloration. ). […]
Weiterlesen … from 40 Piece Multicolor Motivational Color-changing Pencils Heat Activated Inspir…