Bump mark to check for freshness by feel

    Created with the visually impaired in mind but useful to everyone, the bump mark bio-reactive label will change texture as the food within begins to spoil.
    The bump mark will be used with existing packaging, and will be made up of a layer of gelatin (which decays at the same rate as other proteins) coated over a bumpy plastic sheet. The sheet will feel smooth at first, but as the gelatin ages and becomes less solid, the bumps will begin to emerge. The gelatin will be applied in coats of different thicknesses to match the expiration date of the food.