Use of test strips to determine the UV intensity or to pre-determine the duration of stay in the sun without sunburn
AssigneeBoehringer Mannheim GmbH
InventorsManfred Krause, Norbert Kaufmann, Mathias Neumann
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Abstract
The invention concerns the use of test strips with a flat, preferably oblong foil which carries a matrix containing a photoactive chromogenic substance to pre-determine the duration of stay in the sun that is possible without sunburn, a test system for this determination containing test strips and a test strip pack, a test strip pack and a method for the pre-determination of the maximum possible duration of stay in the sun without sunburn using the test system.
Claims7
A method for predetermining the length of exposure to sunlight without sunburn for a person, comprising the following steps:
- exposing to sunlight, a test strip comprising a matrix attached to a flat foil strip, wherein said matrix contains 18-molybdodiphosphoric acid, and
- comparing any color changes in said photoactive chromogenic substance with a chart which correlates color changes in said photoactive chromogenic substance with the maximum duration of exposure to ultraviolet radiation possible without sunburn to the person.
A method for determining the intensity of ultraviolet radiation, comprising the following steps:
- exposing to ultraviolet radiation, a test strip comprising a matrix attached to a flat foil strip, wherein said matrix contains 18-molybdodiphosphoric acid, and
- comparing any color changes in said photoactive chromogenic substance with a chart which correlates color changes in said photoactive chromogenic substance with the intensity of ultraviolet radiation.
A method for predetermining the length of exposure to sunlight without sunburn for a person, in the presence of a substance which blocks ultraviolet radiation on the person's exposed skin, comprising the following steps:
- coating a test strip comprising a matrix sandwiched between a flat foil strip and a UV permeable, moisture impermeable material, with a substance which blocks ultraviolet radiation, wherein said matrix contains 18-molybdodiphosphoric acid,
- exposing said test strip to sunlight, and
- comparing any color changes in said photoactive chromogenic substance with a chart which correlates color changes in said photoactive chromogenic substance with the maximum duration of exposure to ultraviolet radiation possible without sunburn.
Dependencies are inferred from the claim text.