Hey­fair GmbH has devel­oped a hand dis­in­fec­tion solu­tion which makes the com­plete and timely cor­rect dis­in­fec­tion vis­i­ble for 180 sec­onds through an inten­sive col­oration of the skin. After this time, the skin is com­pletely dis­col­ored again.