Abstract: A disposable device for measuring UV radiation comprising: a matrix, at least one photochrome compound provided to said matrix wherein said photochromic compound is capable of changing its color when exposed to UV radiation, color changing agent distributed within said matrix, wherein said color changing agent irreversibly changes the device's color as a function of the UV dose irradiated, whereby said device is not affected by ambient conditions and visible light.

Abstract: The present invention provides a device capable of exhibiting a time-temperature dependence that comprises an upper layer carrying a first reactant selected from a group of materials such as chelating agents and a base layer carrying a second reactant adapted to react with the first reactant upon triggering. A barrier layer is provided between the upper layer and the base layer. Visual characteristic is changed depending on time and temperature after triggering had occurred while the device is not susceptible to environmental conditions and can be stored in room temperature.

Abstract: A polymer-based color changing article manufactured by injection, extrusion or similar methods that comprises transparent polymer matrix, polymeric color changing enhancer additive distributed within the polymer matrix that does not change its optical properties and a chemical compound capable of reversible changing its original color due to a photochemical reaction. The polymer-based color changing article can be used for applications such as lenses, color changing protective shields or sheets for controlling the intensity of light irradiation within a room, car, greenhouse, games, toys, memorabilia, packages for light sensitive food, beverages, and drugs.

Abstract: A disposable device for measuring UV radiation comprising: a matrix, at least one photochrome compound provided to said matrix wherein said photochromic compound is capable of changing its color when exposed to UV radiation, color changing agent distributed within said matrix, wherein said color changing agent irreversibly changes the device's color as a function of the UV dose irradiated, whereby said device is not affected by ambient conditions and visible light.

Abstract: The present invention provides a device capable of exhibiting a time-temperature dependence that comprises an upper layer carrying a first reactant selected from a group of materials such as chelating agents and a base layer carrying a second reactant adapted to react with the first reactant upon triggering. A barrier layer is provided between the upper layer and the base layer Visual characteristic is changed depending on time and temperature after triggering had occurred while the device is not susceptible to environmental conditions and can be stored in room temperature.

Abstract: A disposable dosimeter for sun radiation comprising a matrix with at least one active chemical compound distributed therein, capable of changing its original color to a new color due to a chemical reaction induced by exposure to UV radiation, said matrix made of a material having transparency sufficient for visual detection the change of the original compound's color to the new color, said matrix containing at least one absorbing compound capable of absorbing the UV radiation, said active chemical compound being capable of changing its color after exposure to UV radiation with an efficacy corresponding to at least 1 MED, said UV radiation being accumulated during at least 15 minutes of exposure and said active chemical compound having a resistance to change the new color neither during exposure to temperatures up to 50.degree. C., nor during exposure to visible light.