The present disclosure provides a system including an ultraviolet (UV) light source, a power source configured to provide power to the UV light source, and a photochromatic indicator associated with a component, the photochromatic indicator being in a first state, the UV light source being configured to change the photochromatic indicator from a first state to a second state, the second state indicating that the component has been cleaned, the second state being visible to a naked eye under ambient lighting.

The present invention provides an ultraviolet inspection tool having excellent color formability with respect to light having a wavelength of 222 nm even in a case where an irradiation amount of the light having a wavelength of 222 nm is small, an ultraviolet inspection kit, and an ultraviolet inspection method. The ultraviolet inspection tool of the present invention is an ultraviolet inspection tool including an ultraviolet-sensing layer containing a color-forming agent and an acid generator, in which the color-forming agent has at least one selected from the group consisting of a lactone structure, a lactam structure, a sultone structure, a sultine structure, a ring-opened structure of these structures, and an azobenzene structure, a molecular weight of the acid generator is 600 or less, and a mass ratio of a content of the acid generator to a content of the color-forming agent is 1.01 to 40.00.

The present invention provides an ultraviolet inspection tool having excellent color formability with respect to light having a wavelength of 222 nm even in a case where an irradiation amount of the light having a wavelength of 222 nm is small, an ultraviolet inspection kit, and an ultraviolet inspection method. The ultraviolet inspection tool of the present invention is an ultraviolet inspection tool including an ultraviolet-sensing layer containing a color-forming agent and an acid generator, in which the color-forming agent has at least one selected from the group consisting of a lactone structure, a lactam structure, a sultone structure, a sultine structure, a ring-opened structure of these structures, and an azobenzene structure, a molecular weight of the acid generator is 600 or less, and a mass ratio of a content of the acid generator to a content of the color-forming agent is 1.01 to 40.00.

The present invention provides an ultraviolet-sensing member in which it is easy to determine whether an irradiation amount which inactivates the novel coronavirus has been irradiated, and an ultraviolet-sensing kit. In the ultraviolet-sensing member of the present invention, in a case where, using a KrCl excimer lamp as a light source, the ultraviolet-sensing member is irradiated with light through a filter which substantially shields light having a wavelength of 230 to 300 nm until an irradiation amount of light having a wavelength of 222 nm reaches 3 mJ/cm.sup.2, and using a spectrophotometer Spectrolino (GretagMacbeth AG), optical densities of predetermined colors are measured with the ultraviolet-sensing member before the light irradiation and the ultraviolet-sensing member after the light irradiation, the optical densities show a predetermined value.

The present invention provides an ultraviolet-sensing member in which it is easy to determine whether an irradiation amount which inactivates the novel coronavirus has been irradiated, and an ultraviolet-sensing kit. In the ultraviolet-sensing member of the present invention, in a case where, using a KrCl excimer lamp as a light source, the ultraviolet-sensing member is irradiated with light through a filter which substantially shields light having a wavelength of 230 to 300 nm until an irradiation amount of light having a wavelength of 222 nm reaches 3 mJ/cm.sup.2, and using a spectrophotometer Spectrolino (GretagMacbeth AG), optical densities of predetermined colors are measured with the ultraviolet-sensing member before the light irradiation and the ultraviolet-sensing member after the light irradiation, the optical densities show a predetermined value.

A first object of the present invention is to provide an ultraviolet-sensing member having excellent storage stability and image stability. In addition, a second object of the present invention is to provide a microcapsule, a production method of a microcapsule, a dispersion liquid for forming an ultraviolet-sensing layer, and an ultraviolet-sensing kit.

The ultraviolet-sensing member of the present invention is an ultraviolet-sensing member including an ultraviolet-sensing layer containing a microcapsule which contains a photoactivator, a color-forming agent, and an aromatic solvent,

in which the aromatic solvent includes an aromatic solvent including a heteroatom and an aromatic solvent including no heteroatom.

A first object of the present invention is to provide an ultraviolet-sensing member having excellent storage stability and image stability. In addition, a second object of the present invention is to provide a microcapsule, a production method of a microcapsule, a dispersion liquid for forming an ultraviolet-sensing layer, and an ultraviolet-sensing kit.

The ultraviolet-sensing member of the present invention is an ultraviolet-sensing member including an ultraviolet-sensing layer containing a microcapsule which contains a photoactivator, a color-forming agent, and an aromatic solvent,

in which the aromatic solvent includes an aromatic solvent including a heteroatom and an aromatic solvent including no heteroatom.

Described herein is UV-responsive ink capable of informing the user of UV exposure in real time, and a sun care kit incorporating the same.

The invention provides a light indicator (100) for use in evaluating melanopsin active radiation in a flux of light, the light indicator (100) comprising a first light indicator element (110) comprising a first light reflective element (112) and a second light indicator element (120) comprising a second light reflective element (122), the light reflecting elements (112, 122) having different wavelength dependencies of the spectral reflectivity, wherein the light reflecting elements (112, 122) are selected to provide the same intensity of reflected light of two or more different types of light irradiating on the light indicator elements (110, 120), wherein the two or more different types of light have different spectral power distributions in the visible wavelength range but having the same ratios of the melanopic flux and the luminous flux, wherein the ratio of the melanopic flux and the luminous flux of light is defined as Formula (I) wherein SPD(λ) is the spectral power distribution of the light, m(λ) is the melanopic sensitivity function, and the Y(λ) is the photopic sensitivity.

The invention provides a light indicator (100) for use in evaluating melanopsin active radiation in a flux of light, the light indicator (100) comprising a first light indicator element (110) comprising a first light reflective element (112) and a second light indicator element (120) comprising a second light reflective element (122), the light reflecting elements (112, 122) having different wavelength dependencies of the spectral reflectivity, wherein the light reflecting elements (112, 122) are selected to provide the same intensity of reflected light of two or more different types of light irradiating on the light indicator elements (110, 120), wherein the two or more different types of light have different spectral power distributions in the visible wavelength range but having the same ratios of the melanopic flux and the luminous flux, wherein the ratio of the melanopic flux and the luminous flux of light is defined as Formula (I) wherein SPD(λ) is the spectral power distribution of the light, m(λ) is the melanopic sensitivity function, and the Y(λ) is the photopic sensitivity.