| 摘要 |
An appliance operating with water, such as a washing or dishwashing machine, includes functional devices operable in a manner or sequence taking into consideration the degree of hardness or the range of the degree of hardness of the local mains water. In a region, readily visible to the operator of the appliance, the outer surface of the appliance has a space for the mounting of an indicating member with symbols associated with the degrees or ranges of hardness. A surface (9) of the member is provided with a coating (10) in which symbols (11) are defined by colour-change substances which are of substantially the same colour as the coating and which, on being wetted with water of an associated degree or range of hardness, change into a colour visibly departing from the original colour and the colour of the coating. <IMAGE> |
